How to do factor trees prime factorization
Factor Trees  GCSE Maths
Introduction
What are factor trees?
Prime factor trees
Writing an answer in index form
How to use a factor tree
Factor tree worksheet
Common misconceptions
Practice factor tree questions
Factor trees GCSE questions
Learning checklist
Next lessons
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Introduction
What are factor trees?
Prime factor trees
Writing an answer in index form
How to use a factor tree
Factor tree worksheet
Common misconceptions
Practice factor tree questions
Factor trees GCSE questions
Learning checklist
Next lessons
Still stuck?
Here we will learn about about factor trees including how to construct factor trees and use them in a variety of contexts.
There are also factor trees worksheets based on Edexcel, AQA and OCR exam questions, along with further guidance on where to go next if you’re still stuck.
What are factor trees?
Factor trees are a way of expressing the factors of a number, specifically the prime factorization of a number.
Each branch in the tree is split into factors. Once the factor at the end of the branch is a prime number, the only two factors are itself and one so the branch stops and we circle the number.
We also must remember that 1 is not a prime number and so it will not appear in any factor tree.
Factor trees can be used to:
 find the highest common factor (HCF),
 find the lowest common multiple (LCM) (sometimes called the least common multiple)
 find other numerical properties such as whether a number is square, cube or prime
We can convert different quantities to whole numbers (kilograms to grams for example) to avoid working with decimals.
A factor tree does not contain decimals as we are working with positive factors (natural numbers).
What are factor trees?
Prime factor trees
In order to produce a prime factor tree we need to be able to recall the prime numbers between 1 and 20.
These prime numbers are:
\[2, 3, 5, 7, 11, 13, 17, 19\]
Let’s have a look at an example:
E.g.
Use a factor tree to write 51 as a product prime factors
We split the original number 51 into two branches by writing a pair of factors at the end of the branch,
As 3 × 17 = 51, one branch will end in a 3, the other in 17.
Both the numbers 3 and 17 are prime numbers and so we highlight the prime numbers by circling them.
Now there is a prime number at the end of each branch we have constructed a prime factor tree.
If the numbers were not primes then we would continue to split them into factors until there was a prime number at the end of each branch. 3 × 3\]
How to use a factor tree
In order to use a factor tree:
 Write the number at the top of the factor tree and draw two branches below
 Fill in the branches with a factor pair of the number above
 Continue until each branch ends in a prime number
 Write the solution as a separate line of working (in index form if required)
Explain how to use a factor tree for prime factorisation in 4 steps
Factor trees worksheet
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Factor tree examples
Example 1: standard problem
Express the number 120 as a product of prime factors in index form.
 Write the number at the top of the factor tree and draw two branches below
Here we write 120 at the top of the tree with two branches below:
2Fill in the branches with a factor pair of the number above
The number 120 has many factor pairs. As the number ends in a 0, it is easy to choose 12 × 10 so we have:
3Continue until each branch ends in a prime number
Both the numbers 12 and 10 are not prime numbers so two branches are extended from each number and filled in with their factors:
Here we have highlighted the numbers 3, 5 and 2 as they are prime numbers so the branches are terminated here. However, 4 is not a prime number so we need to continue the branches for this number only:
We now have each branch ending in a prime number and so this factor tree is now complete.
4Write the solution as a separate line of working (in index form if required).
Select each prime number and express them as a product (multiply them):
\[120 = 2 × 2 × 2 × 3 × 5\]
Written in index form:
\[120 = 2^3 × 3 × 5\]
Full solution:
\[120 = 2^3 × 3 × 5\]
Example 2: index from
The number 242 can be written in the form 242 = a × b^{2}. 2 \\\\ &a = 2, \; b=11 \end{aligned}
Example 3: unique factor tree
Complete the diagram to show the prime factor decomposition of the missing number in index form.
Write the number at the top of the factor tree and draw two branches below
The number at the top of the tree is the product of the branches below. This means that the number we are expressing is equal to:
\[5 × 20 = 100\]
Fill in the branches with a factor pair of the number above
Looking further down the diagram, we can see that the number 20 is split into two factors. One of those factors is equal to 5 therefore the other factor must be:
\[20 ÷ 5 = 4\]
Continue until each branch ends in a prime number
The only factor pair of 4 that does not include 1 is 2 × 2 = 4 therefore the two values in the branches are equal to 2:
Write the solution as a separate line of working (in index form if required)
Here we are finding the product of prime factors of 100, so:
\begin{aligned} 100 &= 2 × 2 × 5 × 5\\\\ 100 &= 2^2 × 5^2 \end{aligned}
Full solution:
\[100 = 2^2 × 5^2\]
The factor tree in this question is unique because it was already partially completed. 2 = 3 × 7 × x × x\]
Common misconceptions
 Using addition instead of multiplication
E.g.
When creating a factor tree for say 26, a common mistake is to write the factors of 26 as 13 and 13. This is incorrect as 13 × 13 = 169 giving the prime factor decomposition of 169, not 26.
 Assuming a number is prime
There are several numbers which are frequently misused as a prime number, here are a few of them:
1, 9, 15, 21, 27
They are usually a multiple of 3 unless they are more difficult to split into factors, such as 57 and 91. (57 = 3 × 19, 91 = 7 × 13).
 Not writing the final solution
After completing the factor tree, you must write the number as a product of its factors, otherwise you have demonstrated a method but not answered the question (such as using grid multiplication and not adding up the values in the grid for your final solution). {2}\times5
(1)
\sqrt{180}=2 \times 3 \times \sqrt{5}
(1)
\sqrt{180}=6\sqrt{5}
(1)
Learning checklist
You have now learned how to:
 use the concepts and vocabulary of prime numbers, factors (or divisors), prime factorisation, including using product notation and the unique factorisation property.
The next lessons are
 Highest common factor
 Lowest common multiple
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Prime Factorization
Prime Numbers
A Prime Number is:
a whole number greater than 1 that can not be made by multiplying other whole numbers
The first few prime numbers are: 2, 3, 5, 7, 11, 13, 17, 19 and 23, and we have a prime number chart if you need more.
If we can make it by multiplying other whole numbers it is a Composite Number.
Like this:
2 is Prime, 3 is Prime, 4 is Composite (=2×2), 5 is Prime, and so on...
Factors
"Factors" are the numbers you multiply together to get another number:
Prime Factorization
"Prime Factorization" is finding which prime numbers multiply together to make the original number.
Here are some examples:
Example: What are the prime factors of 12 ?
It is best to start working from the smallest prime number, which is 2, so let's check:
12 ÷ 2 = 6
Yes, it divided exactly by 2. We have taken the first step!
But 6 is not a prime number, so we need to go further. Let's try 2 again:
6 ÷ 2 = 3
Yes, that worked also. And 3 is a prime number, so we have the answer:
12 = 2 × 2 × 3
As you can see, every factor is a prime number, so the answer must be right.
Note: 12 = 2 × 2 × 3 can also be written using exponents as 12 = 2^{2} × 3
Example: What is the prime factorization of 147 ?
Can we divide 147 exactly by 2?
147 ÷ 2 = 73½
No it can't. The answer should be a whole number, and 73½ is not.
Let's try the next prime number, 3:
147 ÷ 3 = 49
That worked, now we try factoring 49.
The next prime, 5, does not work. But 7 does, so we get:
49 ÷ 7 = 7
And that is as far as we need to go, because all the factors are prime numbers.
147 = 3 × 7 × 7
(or 147 = 3 × 7^{2} using exponents)
Example: What is the prime factorization of 17 ?
Hang on ... 17 is a Prime Number.
So that is as far as we can go.
17 = 17
Another Method
We showed you how to do the factorization by starting at the smallest prime and working upwards.
But sometimes it is easier to break a number down into any factors you can . .. then work those factor down to primes.
Example: What are the prime factors of 90 ?
Break 90 into 9 × 10
 The prime factors of 9 are 3 and 3
 The prime factors of 10 are 2 and 5
So the prime factors of 90 are 3, 3, 2 and 5
Factor Tree
And a "Factor Tree" can help: find any factors of the number, then the factors of those numbers, etc, until we can't factor any more.
Example: 48
48 = 8 × 6, so we write down "8" and "6" below 48
Now we continue and factor 8 into 4 × 2
Then 4 into 2 × 2
And lastly 6 into 3 × 2
We can't factor any more, so we have found the prime factors.
Which reveals that 48 = 2 × 2 × 2 × 2 × 3
(or 48 = 2^{4} × 3 using exponents)
Why find Prime Factors?
A prime number can only be divided by 1 or itself, so it cannot be factored any further!
Every other whole number can be broken down into prime number factors.
It is like the Prime Numbers are the basic building blocks of all numbers. 
This idea can be very useful when working with big numbers, such as in Cryptography.
Cryptography
Cryptography is the study of secret codes. Prime Factorization is very important to people who try to make (or break) secret codes based on numbers.
That is because factoring very large numbers is very hard, and can take computers a long time to do.
If you want to know more, the subject is "encryption" or "cryptography".
Unique
And here is another thing:
There is only one (unique!) set of prime factors for any number.
Example: the prime factors of 330 are 2, 3, 5 and 11
330 = 2 × 3 × 5 × 11
There is no other possible set of prime numbers that can be multiplied to make 330.
In fact this idea is so important it is called the Fundamental Theorem of Arithmetic.
Prime Factorization Tool
OK, we have one more method ... use our Prime Factorization Tool that can work out the prime factors for numbers up to 4,294,967,296.
370, 1055, 1694, 1695, 1696, 1697
What is a Factor Tree? – Wiki Reviews
Factor Trees a way of expressing the divisors of a number , in particular the simple factorization of a number. Each branch of the tree is divided into factors. As soon as the factor at the end of the branch is a prime number, there are only two factors left  itself and one, so the branch stops and we circle the number.
In the same way, how to draw a factor tree for the number 30? The number 30 can be written in simple factorization as 2 x 3 x 5 . All factors are prime numbers. Using exponential form, 30 = 213151, which indicates that there is one 2, one 3, and one 5 multiplied together to get the result 30.
What is the Factor Tree of 30? FactorTree. The number 30 can be written as 6 x 5 . Then the number 6 can be written as 2 x 3. A factor tree representing this is shown below. Although the number 30 can be decomposed in different ways, the result will always be one 2, one 3, and one 5.
Second, what is an example of a factor tree? In other words, a factor tree is a tool that factorizes any number into its prime factors of . … For example, if we consider 2 * 3 = 6, then 2 and 3 are factors of 6. But we can also say that 1 * 6 = 6. So 6 has four factors: 1, 2, 3, and 6.
What is a factor tree 30?
Factor Tree. The number 30 can be written as 6 x 5 . Then the number 6 can be written as 2 x 3. A factor tree representing this is shown below. Although the number 30 can be decomposed in different ways, the result will always be one 2, one 3, and one 5.
then how to find the factor 30? Factors 30
 Factors 30: 1, 2, 3, 5, 6, 10, 15 and 30.
 Negative Factors 30: 1, 2, 3, 5, 6, 10, 15 and 30.
 Summing up 30: 2, 3, 5.
 Simple factorization of 30: 2 × 3 × 5 = 2 × 3 × 5.
 Sum of the factors of 30: 72.
What is the Factor Tree of 20? Its main factors are 1, 2, 4, 5, 10, 20 and (1, 20), (2, 10) and (4, 5) are pair coefficients. What are Factors 20?
What is a 48 factor tree?
Factors of 48 is a list of integers that can be divided by 48 without a remainder. There are a total of 10 factors in it, of which 48 is the largest factor, and the prime factors of 48 are 2 and 3 . Simple factorization of the number 48 is 2. ^{ 4 } × 3.
...
Positive pair factors 48.
Factors  Partial factors 

3 16 × 48 = XNUMX XNUMX  3, 16 
4 12 × 48 = XNUMX XNUMX  4, 12 
6 8 × 48 = XNUMX XNUMX  6, 8 
How to draw a factor tree from 36? Answer: It draws the complete factor tree for 36 = 2 x 18 as shown. Draw factor trees that start with 36 = 4 x 9, then 36 = 6 x 6." Discuss why all tree ends show 36 = 2 x 3 x 3 x 2. Examples. Noticing that 24 = 2 x 12, 24 = 8 x 3, 24 = 6 x 4, draw multiplier trees, all of which show 24 = 2 x 2. 2x3xXNUMX at the end....
What is factor tree 16?
In the case of a simple tree factorization, 16 will also be expressed as 16= 2×2×2×2=24 .
What is a 72 factor tree? Prime factors are circled in the factor tree. So the prime factors of 72 are written as 72. = 2×2×2×3×3 .
What is the factor tree for 54?
Factors of 54 is a list of integers that can be equally divided by 54. There are 8 factors of 54 in total, among which 54 is the largest factor, and its positive factors are 1, 2, 3, 6, 9, 18, 27 and 54. .
...
Factors 54 in pairs.
Factors  Pare factors  

3 × 18 = 54  3, 18  
6 9 × 54 = XNUMX XNUMX  6, 9  9. 6 
18 3 × 54 =  18.3 
What is the factor tree for 24?
What is a multiple of 30? Multiplicity 30 30, 60, 90 , 120, 150, 180, 210, 240, 270, 300, 330, 360, 390, 420, etc.
What is the ratio of 20 and 30? The numbers 4 and 20 have 30 common divisors: 1, 2, 10 , and 5. Therefore, the greatest common divisor of 20 and 30 is 10.
What is the factor 31?
Coefficients 31 are 1 and 31 . It is only expressed as 31 × 1 or 1 × 31. Therefore, 31 is a prime number.
What is a factor tree 78?
The numbers we multiply to get 78 are divisors of 78. The factors of 78 are 1, 2, 3, 6, 13, 26, 39 and 78 .
What is the Factor Tree of 66? It can be represented as a tree of factors. Thus, the primary factorization can be written as follows. 66 = 2×3×11 .
How to build a factor tree?
What is the factor tree of 33? Finding a factor tree of 33 to get 9 factors0005
33  

3  11 
65 Distribution for simple multipliers: 77, 78. Updation of the number for simple multipliers  Ecodoma: DIFREED
Content 9000
Number 65
4Sum of digits  11 
Product of digits  30 
Product of digits (excluding zero)  30 
All divisors of  1, 5, 13, 65 
Greatest divisor of a series of powers of two  1 
Number of dividers  4 
Sum of divisors  84 
Prime number?  No 
Semiprime?  Yes 
Reciprocal of  0. 015384615384615385 
Roman notation  LXV 
IndoArabic spelling  ٦٥ 
Morse code  …. ….. 
Factoring  5*13 
Binary  1000001 
Trinity  2102 
Octal  101 
Hexadecimal (HEX)  41 
Translation from bytes  65 bytes 
Color  RGB(0, 0, 65) or #000041 
Highest digit in (possible base)  6 (7) 
Fibonacci number?  No 
Numerological value  2 femininity, sensitivity, intuition, intimacy, support, trust, cooperation, peace, diplomacy 
Sine of  0. 8268286794 
Cosine of  0.562453851238172 
Tangent of number  1.4700382576631723 
Natural logarithm  4.174387269895637 
Decimal logarithm  1.81266428555 
Square root  8. 06225774829855 
Cube root  4.020725758589058 
Square of  4225 
Translation from seconds  1 minute 5 seconds 
UNIX date  Thu, 01 Jan 1970 00:01:05 GMT 
MD5  fc490ca45c00b1249bbe3554a4fdf6fb 
SHA1  2a459380709e2fe4ac2dae5733c73225ff6cfee1 
Base64  NjU= 
QR code number 65 
77, 78.
Factoring a number into prime factors
You need to know this
Factoring a natural number means representing it as a product of natural numbers.
To factor a natural number into prime factors means to represent it as a product of prime numbers.
When decomposing large numbers into prime factors, a column entry is used:
Example: Factor the number 84 into prime factors.
When decomposing a number into prime factors, we divide it into prime factors, starting with 2, then we take 3, 5, 7, 11, ..., until we get the number 1 in the quotient.
84  2 the number 84 is divisible by 2
42  2 42 is divisible by 2
21  3 the number 21 is divisible by 3
7  7 the number 7 is divisible by 7
1 
Answer: 84 = 2∙ 2∙ 3∙ 7
Video tutorial
5 * 13 Dividers 1, 5, 13, 65 Number of dividers 4 Sum of divisors 84 Previous integer 64 Next integer 66 Prime number? NO Previous downtime 61 Next simple 67 65th prime 313 Is it a Fibonacci number? NO Bell number? NO Catalan number? NO Factorial? NO Regular number? NO Perfect number? NO Polygon number (s < 11)? octagonal(5) Binary 1000001 Octal 101 Duodecimal 55 Hexadecimal 41 Square 4225 Square root 8. 0622577482985 Natural logarithm 4.1743872698956 Decimal logarithm 1.81266429 Sinus 0.8268286794901 Cosine 0.56245385123817 Tangent 1.4700382576632 Math settings for your site Select Language :Deutsch
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Problems in mathematics on the topic Decomposition into prime factors
Found a mistake? Report in the comments (at the bottom of the page)
121 Factorize the numbers 216; 162; 144; 512; 675; 1024; 60; 180; 220; 350; 400; 1200; 8000; eleven; 1001; 1225; 21780; 45 630.
SOLUTION
122 Write all twodigit numbers whose factorization into prime factors consists of: a) two; b) from three identical multipliers.
SOLUTION
123 Write down all twodigit numbers that can be factored into two distinct prime factors, one of which is: 11; 13; 23; 47.
SOLUTION
124 Find out if a is divisible by b without remainder if a = 2 2 2 3 5 7 and b = 2 3 7; a = 3 3 5 5 11 and b = 3 3 5;… in the case where a is divisible by b, find the quotient.
SOLUTION
125 Calculate orally: 3.99 + 2.01; 2.3 + 0.007; 3. 62 + 1.08; 3.06 + 1.94; 12.77 + 0.13; 0.70.06; 10.48; 21.02; 0.65  0.5; 0.80.25; 1.6:100; 5:10; 12:1000; 2.3:0.1; 4:0.01; 0.4 0.3125; 3.81.72.81.7; 4.712.50.8; 3.1 3.7 + 3.1  6.3; 49.3 + 0 49.3.
SOLUTION
126 For which natural values of a is the product 23a a prime number?
DECISION
127 Is there a rectangle whose sides are natural numbers and whose perimeter is a prime number?
SOLUTION
128 Find two prime divisors of each of the numbers: 64; 62; 148; 182; 3333; 5005.
SOLUTION
129 Which prime numbers are solutions to the inequality 17
SOLUTION
130 Can the coordinates of points A, B, C and D be prime numbers if p is a prime number?
SOLUTION
131 Express the number 3 as a fraction with denominator 5; number 1  with denominator 12.
SOLUTION
132 Do
SOLUTION
133 Out of 35 students in the fifth grade, 22 subscribe to the Young Naturalist magazine, 27 to the Pionerskaya Pravda newspaper, and 3 students do not subscribe to either a newspaper or a magazine. How many students subscribe to the newspaper and magazine?
SOLUTION
134 The book is 100% more expensive than the album. By what percent is the album cheaper than the book? The mass of the goose is 25% more than the mass of the duck. By what percent is the weight of a duck less than that of a goose?
SOLUTION
135 For which numerical expression is the calculation program made on the microcalculator
SOLUTION
136 The sides of a triangle are 12 cm, 17 cm and x cm. Write an expression to calculate the perimeter of this triangle. What the x value may or may not be.
SOLUTION
137 How many even fourdigit numbers can be made from the digit 0,2,3,4,5?
RESOLUTION
138 1) Two teams of cotton growers harvested together 20.4 quintals of cotton per day. At the atom, the first brigade collected 1.52 centners more than the second. How many quintals of cotton did each brigade collect? 2) Two combine harvesters harvested wheat from 64. 2 hectares. How many hectares did each combiner harvest if the first harvester harvested 2.8 hectares less than the second?
SOLUTION
139 Find the value of the expression (139.5:3.8) 0.3; (16.1:4.63.07) 0.2; (1.3 2.8 + 1): 0.8; (3.7 2.35):0.3
SOLUTION
140 On the surface of the cube, find the shortest path from point A to point C through point B; from A to C, which would intersect all the side edges of the cube except AC.
SOLUTION
141 Prime the numbers 54; 65; 99; 162; 10,000; 1500; 7000; 3240; 4608.
SOLUTION
142 Do
SOLUTION
143 Two tractor drivers plowed 12.32 hectares of land, one of them plowed 1.2 times less than the other. How many hectares of land did each tractor driver plow?
SOLUTION
144 Substitute in the table the appropriate natural values of x and y and infer whether the result of each action is even or odd.
SOLUTION
145 Perform steps (424.2  98.4): 3.6 0.9 + 9.1; (96. 6 + 98.6): 6.4 1.2  0.2.
SOLUTION
Prime and composite numbers  School lessons in simple language
 Owl, thank you very much for science,  Winnie the Pooh thanked that,  now Piglet and I can easily share our honey, so that I have enough for winter, and Piglet was not ashamed to go to his cousin Peppa.
But after counting their supplies, the bear and his friend were confused. Owl noticed this.
— What happened to Vinnie? The knowledge you have gained should be enough to separate the honey.
 We have a problem,  began Piglet,  the number of jars of honey that Winnie has in the basement cannot be divided by 2 or 3, or in general, by any number.
— I completely forgot, — the Owl said guiltily, — the old one has already become. Didn't tell you about prime and composite numbers.
We already know from previous lessons that division and multiplication are inverse arithmetic operations:
A:B=n; A=B·n
e. g. , 65:13=5; 65=13 5
we can say that A contains B repeated n times. Or B is a multiple of A  n times.
We have already said that not all natural numbers are divisible by other natural numbers.
For example , 12:4=3  in 12 four "fits" 3 times.
But 13 by 4 is no longer completely divisible  in 13, four fits 3 times, but there is still 1 (one), which is called the remainder.
— Are there natural numbers that are not divisible by any other number? asked the curious Piglet.
 No, Piglet, there are no such numbers, because any number is divisible by 1 and itself:
A:1=A; A:A=1
For example , 12:1=12; 12:12=1 or 13:1=13; 13:13=1.
Any natural number has at least two divisors  one and itself.
The only exception is the number 1, which has one divisor  1.
The number 2 has two divisors: 1 and 2  2:1=2; 2:2=1.
The number 3 also has two divisors: 1 and 3  3:1=3; 3:3=1.
But the number 4 already has three divisors: 1, 2 and 4  4:1=4; 4:2=2; 4:4=1.
Natural numbers that have only two divisors (1 and itself) are called prime numbers. Natural numbers with more than two divisors are called composite numbers.
The number 1 is neither a prime nor a composite number.
The number 2 is the only even prime number.
All even numbers greater than 2 are composite numbers because they are all divisible by 1, itself and 2 (see divisibility criteria).
— How can prime numbers be learned? asked an intrigued Pooh.
“Unfortunately, Vinnie, prime numbers cannot be learned like a multiplication table,” Owl upset the bear.  There are too many of them, infinitely many, and they have no regular sequence.
— How are they found?  in unison asked the surprised bear with the piglet?
— Very simply, — with the help of the sieve of Eratosthenes, — the wise Owl answered the astonished listeners.
A long time ago, in ancient Greece, there lived a great mathematician of that time, whose name was Eratosthenes. In the III century BC, Eratosthenes invented a method for finding prime numbers, which is still used today.
Modern science, using the principle of the sieve of Eratosthenes, has compiled tables with millions of prime numbers.
Sieve of Eratosthenes
The principle of operation of the sieve of Eratosthenes is quite simple.
For example, let's find all prime numbers in the range from 1 to 50.
Let's write down all the numbers starting from 2 and ending with 50 (1 is neither a prime nor a composite number):
Numbers 2 and 3 (we will talk about this already said)  simple, circle them in green.
We also said that all other even numbers are composite numbers  we cross them out (red color):
Then we cross out all numbers that are multiples of 3, they will also be composite:
The first number not crossed out is 5, it will be prime, t not divisible by smaller numbers except 1. Cross out all multiples of 5:
The first noncrossed out number is 7, it is prime, because it is not divisible by smaller numbers except 1. Cross out numbers that are multiples of 7:
It makes no sense to check further  all the remaining numbers that have not been crossed out will be simple.
Why?
The fact is that 7 7=49, and 50 is a composite number. If there were any noncrossedout composite number left between 7 and 49, it must have a divisor of 7 or less. But we have already sorted out all the numbers that are multiples of the numbers 2, 3, 5, 7 and crossed out. Therefore, after 7, only numbers that do not have divisors in the range from 2 to 7 remain. The first composite (of the not crossed out) numbers after 7 will be 49 (square of seven), therefore, everything that remains not crossed out in the range from 7 to 49will be prime numbers.
This is the principle of finding prime numbers using the sieve of Eratosthenes, through which composite numbers are “sifted”.
For example, to find prime numbers from 2 to 1000, you will need to take 11 “steps”, going through and deleting composite numbers that are multiples of prime numbers: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31.
Why? Because 32 32=1024, which is already more than 1000.
Table of prime numbers from 2 to 1000:
Any composite number can be decomposed into prime factors.
The order of decomposition of numbers into prime factors
For the decomposition of any number into prime factors, a table of prime numbers and divisibility criteria are used. They sort through all the prime numbers from the table one by one until they reach the limit when division does not give 1.
Is it determined whether the original number is divisible by 2? If it is divided, then division is made, and then they work with the resulting quotient. If the original number is not divisible by 2, the sign of division by 3 is checked, and so on.
For example, let's decompose the number 100 into prime factors:
Since the number 100 is greater than 2 and is even, it is not prime, which means that it can be decomposed into prime factors.
100 is divisible by 2? Yes. 100:2=50.
50 prime? No, it means we continue the expansion.
50 is divisible by 2? Yes. 50:2=25.
25 prime number? No, it means we continue the expansion.
25 is divisible by 2? No.
25 is divisible by 3? No.
25 is divisible by 5? Yes. 25:5=5.
5 prime number? Yes. 5:5=1. Decomposition completed.
100=2 2 5 5
As another example, let's factorize the number 253.
Looking at the table of prime numbers, is the number 253 prime? No. So it can be decomposed into prime factors.
253 is divisible by 2? No, because the last digit is odd.
253 is divisible by 3? No, because the sum of the digits is not a multiple of 3. Is
253 divisible by 5? No, because the last digit is neither 5 nor 0.
253 is divisible by 7? No.
253 is divisible by 11? Yes. 253:11=23.
23 is a prime number? Yes. 23:23=1.
Decomposition completed.
The number 253 can be decomposed into two prime factors:
253=11 23.
To speed up the decomposition of a number ending in zero into prime factors, you can immediately write down two prime factors 2 and 5, since 2 5=10, after which the last zero of the original number should be discarded, and the decomposition should continue.
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Decomposition into prime factors  GDZ answers textbook Vilenkin Zhokhov Grade 6
121. Decompose the numbers into prime factors: a) 216; 162; 144; 512; 675; 1024; b) 60; 180; 220; 350; 400; 1200; 8000; at 11; 1001; 1225; 21,780; 45630.
162 = 2 * 81 = 2 * 3 * 27 = 2 * 3 * 3 * 9 = 2 * 3 * 3 * 3 * 3;
144 = 2 * 72 = 2 * 2 * 36 = 2 * 2 * 2 * 18 = 2 * 2 * 2 * 2 * 9= 2 * 2 * 2 * 2 * 3 * 3;
512 = 2 * 256 = 2 * 2 * 128 = 2 * 2 * 2 * 64 = 2 * 2 * 2 * 2 * 32 = 2 * 2 * 2 * 2 * 2 * 16 = 2 * 2 * 2 * 2 * 2 * 2 * 8 = 2 * 2 * 2 * 2 * 2 * 2 * 2 * 4 = 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2;
675 = 5 * 135 = 5 * 5 * 27 = 5 * 5 * 3 * 9 = 5 * 5 * 3 * 3 * 3;
1024 = 2 * 512 = 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2.
b) 60 = 2 * 30 = 2 * 2 * 15 = 2 * 2 * 3 * 5 ;
180 = 2 * 90 = 2 * 2 * 45 = 2 * 2 * 3 * 15 = 2 * 2 * 3 * 3 * 5;
220 = 2 * 110 = 2 * 2 * 55 = 2 * 2 * 5 * 11;
350 = 2 * 175 = 2 * 5 * 35 = 2 * 5 * 5 • 7;
400 = 2 * 200 = 2 * 2 * 100 = 2 * 2 * 2 * 50 = 2 * 2 * 2 * 2 * 25 = 2 * 2 * 2 * 2 * 5 * 5;
1200 = 3 * 400 = 2 * 2 * 2 * 2 * 3 * 5 * 5;
8000 = 2 * 4000 = 2 * 2 * 5 * 400 = 2 * 2 * 2 * 2 * 2 * 2 * 5 * 5 * 5.
c) 11 = 1 * 11;
1001 = 7 * 143 = 7 * 11 * 13;
1225 = 5 * 245 = 5 * 5 * 49 = 5 * 5 * 7 * 7;
21 780 = 2 * 10890 = 2 * 2 * 5445 = 2 * 2 * 5 * 1089 = 2 * 2 * 3 * 5 * 363 = 2 * 2 * 3 * 3 * 5 * 121 = 2 * 2 * 3 * 3*5*11*11;
45630 = 2 * 22815 = 2 * 3 * 7605 = 2 * 3 * 3 * 2535 = 2 * 3 * 3 * 3 * 845 = 2 * 3 * 3 * 3 * 5 * 169 = 2 * 3 * 3 * 3 * 5 * 13 * 13.
122. Write all twodigit numbers whose decomposition into prime factors consists of: a) two identical factors; b) from three identical multipliers.
a) 25 = 5 * 5; 49 = 7 * 7.
b) 27 = 3 * 3 * 3.
b) 13; c) 23; d) 47.
124. Find out if the number a is divisible by the number b without a remainder if:
b) a = 3 * 3 * 5 * 5 * 11 and b = 3 * 3 * 5;
c) a = 3 * 3 * 5 * 7 * 13 and b = 3 * 5 * 5 * 13;
d) a = 2 * 3 * 3 * 7 * 7 and b = 21;
e) a = 2 * 2 * 3 * 3 * 3 * 5 * 7 and b = 135;
e) a = 2 * 2 * 2 * 3 * 3 * 5 * 5 and b = 1000.
In the case where a is divisible by b, find the quotient.
125. Calculate orally:
a) 3.99 + 2.01=6;
2.3 + 0.007=2.307;
3.62 + 1.08=4.7;
3.06 + 1.94=5;
12.77 + 0.13=12.9;
b) 0.7 − 0.06=0.64;
1  0.48=0.52;
2  1.02=0.98;
0.65  0.5=0.15;
0. 8  0.25=0.55;
c) 1.6: 100=0.016;
5 : 10=0.5;
12 : 1000=0.012;
2.3: 0.1=23;
4 : 0.01=400;
d) 0.4 * 0.31 * 25 = 3.1;
3.8 * 1.7  2.8 * 1.7=1.7;
4.7*12.5*0.8=47;
3.1 * 3.7 + 3.1 * 6.3=31;
49.3 + 0 * 49.3=49.3.
126. Under what natural values of a is the product 23a a prime number?
With a = 1, 23a = 23 * 1 = 23.
Does not exist because the sum of the sides is multiplied by two when calculating the perimeter:
P = 2 * (a + b).
128. Find two prime divisors of each of the numbers: 54; 62; 143; 182; 3333; 5005.
129. What prime numbers are solutions to the inequality 17 < p < 44?
19, 23, 29, 31, 37, 41, 43.
130. Can the coordinates of points A, B, C and D (Fig. 5) be prime numbers if p is a prime number?
131. Imagine: a) the number 3 as a fraction with a denominator of 5; b) the number 1 as a fraction with a denominator of 12.
132. Do the action:
133. Of the 35 students in the fifth grade, 22 subscribe to a magazine, 27 to a newspaper, and 3 students subscribe to neither a newspaper nor a magazine. How many students subscribe to the newspaper and magazine?
134. a) The book is 100% more expensive than the album. By what percent is the album cheaper than the book?
b) Goose weighs 25% more than duck. By what percent is the mass of a duck less than the mass of a goose?
135. For what numerical expression was the calculation program made on the microcalculator:
a) 7.46 + 8.7 ÷ 0.016 + 6.9 =;
b) 10.2 + 8.83 − 20 ↔ =?
a) (7. 46 + 8.7): 0.016 + 6.9
b) 20 − (10.2 + 8.83)
: a) write an expression to calculate the perimeter of this triangle; b) think about what the value of x can be and what it cannot be.
a) P = 12 + 17 + x, where P is the perimeter of the rectangle => x > 5. From two inequalities we get the condition: 5 < x < 29.
137. How many even fourdigit numbers can be made from the numbers 0, 2, 3, 4, 5?
138. Solve the problem:
1) Two teams of cotton growers gathered together 20.4 centners of cotton per day. At the same time, the first brigade collected 1.52 centners more than the second. How many quintals of cotton did each brigade collect?
2) Two combine harvesters harvested wheat from 64.2 ha. How many hectares did each combiner harvest if the first harvester harvested 2.8 hectares less than the second?
139. Find the value of the expression:
140. On the surface of the cube (Fig. 6), find the shortest path: a) from point A to point C through point B; b) from point A to point C, which would intersect all the side edges of the cube, except for the edge AC.
141. Factor the numbers:
a) 54; 65; 99; 162; 10,000;
b) 1500; 7000; 3240; 4608.
a) 54 = 2 * 27 = 2 * 3 * 9 = 2 * 3 * 3 * 3;
65 = 5 * 13; 99 = 3 * 33 = 3 * 3 * 11;
162 = 2 * 81 = 2 * 3 * 27 = 2 * 3 * 3 * 9 = 2 * 3 * 3 * 3 * 3;
10000 = 2 * 5000 = 2 * 2 * 2500 = 2 * 2 * 2 * 1250 = 2 * 2 * 2 * 2 * 625 = 2 * 2 * 2 * 2 * 5 * 125 = 2 * 2 * 2 * 2 * 5 * 5 * 25 = 2 * 2 * 2 * 2 * 5 * 5 * 5 * 5.
b) 1500 = 2 * 750 = 2 * 2 * 375 = 2 * 2 * 3 * 125 = 2 * 2 * 3 * 5 * 25 = 2 * 2 * 3 * 5 * 5 * 5;
7000 = 2 * 3500 = 2 * 2 * 1750 = 2 * 2 * 2 * 875 = 2 * 2 * 2 * 5 * 175 = 2 * 2 * 2 * 5 * 5 * 35 = 2 * 2 * 2 * 5 *5*5*7;
3240 = 2 * 1620 = 2 * 2 * 810 = 2 * 2 * 2 * 405 = 2 * 2 * 2 * 3 * 135 = 22 * 2 * 3 * 3 * 45 = 2 * 2 * 2 * 3 * 3 * 315 = 2 * 2 * 2 * 3 * 3 * 3 * 3 * 5;
4608 = 2 * 2304 = 2 * 2 * 1152 = 2 * 2 * 2 * 576 = 2 * 2 * 2 * 2 * 288 = 2 * 2 * 2 * 2 * 2 * 144 = 2 * 2 * 2 * 2 * 2 * 2 * 72 = 2 * 2 * 2 * 2 * 2 * 2 * 2 * 36 = 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 * 18 = 2 * 2 * 2 * 2 * 2 *2*2*2*29= 2*2*2*2*2*2*2*2*2*3*3 one of them plowed 1. 2 times less than the other. How many hectares of land did each tractor driver plow?
144. Substitute in the table suitable natural values x and y and draw conclusions about the even or odd result of the action in each case:
145. Do the following: a) (424.2  98.4): 3.6 * 0.9 + 9.1; b) (96.6 + 98.6): 6.4 * 1.2  0.2.
+ 9.1 = 81.45 + 9.1 = 90.55
b) (96.6 + 98.6) : 6.4 * 1.2 − 0.2 = 195.2 : 6.4 • 1.2  0.2 = 30.5 * 1.2  0.2 = 36.6  0.2 = 36.4
Decomposition of a composite number into prime factors
I offer students pictures: a mosaic, a rainbow, cutlery tools, a salad recipe. Using the pictures, we will try to formulate the topic and purpose of lesson
Question: What do these pictures have in common? How can it be related to the topic of the lesson? .
(mosaic can be folded, salad consists of ingredients, a rainbow of 7 colors, cutlery from items that we all know. )
We formulate the topic of the lesson.
We ask the question: what do we know from this topic, and what do we need to know?
(a natural number, prime factors  this is familiar to us, decomposition into prime factors is not familiar.)
Formulation of the purpose of the lesson.
Damage of the composite number into simple multipliers
Met thawed chain
Purpose:
1. SELE OF ELLASE EXTRAMS
2 2 ∙ 5 ∙ 5 ∙
100 2 ∙ 2 ∙ 3 ∙ 5
66 5 ∙ 5 3 60=2 ^{ 2 } ∙ 3 ∙ 5 24 = 2 ^{ 3 } ∙ 3 100 = 2 ^{ 2 } ∙ 5 ^{ 2 } 66 = 2 ∙ 11
Descriptor
 7

Find the corresponding number

Write the same factors as a power

Record as product
Perform the product of numbers
Conclusion: Any composite number can be decomposed into prime factors. If we do not take into account the order of writing the factors, then we get the same decomposition for any method.
After individual study of the text, all questions are discussed in the group.
Video
Goal
Task: Group work
Factorize
913 917 91361 group
2 group  3 group  4 group  
150  204  369  400 
After completing the tasks, the correct answers are chosen from the cards with the image of the pavilions of the countries participating in EXPO.
Student's short story about EXPO
Differentiated tasks. In the form of a mathematical Relay race
Students in groups solve the following tasks of their choice (triangle  simple, square  medium, circle  complex):
Triangle specification:
1. Numbers and their factorizations in the table are given. Find the reinforcement of the number with their decompositions, put the letters in order and be sung to:
1) 60
2) 125
3) 120
4) 240
5) 164
6) 222
a  n  a  t  a  from 
2 ^{ 4 } ∙3∙5  2 ^{ 2 } ∙41  2 ^{ 2 } ∙3∙5  2 ^{ 3 } ∙3∙5  2∙3  5 ^{ 3 } 
Task square:
0091 3 . Find the dimensions of the box.
Object Task:
1. Given the numbers: a = 720 b = 90 s = 240
Write the decays of numbers:
1) A ∙ b
2) a: b
3) and ∙ b:c
Evaluation criteria  Descriptors 
triangle  
job  Correctly factored the number 
square  
job  Specifies that the box has the shape of a parallelepiped, the number is to be multiplied by three 
Uses column entry and finds factors 220=2 ^{ 2 } ∙5∙11  
Correctly writes down the answer: 4dm, 5dm and 11dm  
circle  
job  Performed actions correctly: 1)720= 2 ^{ 4 } ∙3 ^{ 2 } ∙5 2) 90= 2∙3 ^{ 2 }∙5 3) 240= 2 ^{ 4 } ∙3∙5 a∙b=2 ^{ 4 }∙3 ^{ 2 }∙5∙2∙3 ^{ 2 }∙5 2)a:b=2 ^{ 4 } ∙3 ^{ 2 } ∙5:(2∙3 ^{ 2 } ∙5) ^{ } 3)a∙b:c=2 ^{ 5 } ∙3 ^{ 4 } ∙5 ^{ 2 } :(2 ^{ 4 } ∙3∙5) 
Checking on the interactive whiteboard
Individual work
Using a graphic organizer.
Continue building the tree.
63 108 105
7
Each correct answer is worth 1 point.
If you scored:
points  you are smart. points  well done. You are doing well, see what you need to repeat. points  good.
Repeat those tasks in which you made mistakes.
multipliers of 65  from our multiplier calculator
What are the multipliers of 65?
These are whole numbers that can be divided by 65 without a remainder; they can be expressed as individual
factors or as pairs of factors. In this case, we represent them both ways. This is the mathematical expansion of a certain number.
Although this is usually a positive integer, note the comments below about negative numbers.
What is prime factorization of 65?
Prime factorization is the result of decomposing a number into a set of components, each member of which is a prime number. This is usually written by displaying 65 as the product of its prime factors.
For
65, this result would be:
65 = 5 x 13
(this is also known as prime factorization; the smallest prime number in this series is described as the smallest prime factor)
Is 65 a composite number?
Yes! 65 is a composite number. It is the product of two positive numbers other than 1 and itself.
Is 65 a square number?
No! 65 is not a square number. The square root of this number (8.06) is not an integer.
How many factors are there in 65?
This number consists of 4 factors: 1, 5, 13, 65
More specifically, shown as pairs of …
(1 * 65) (5 * 13) (13 * 5) (65 * 1)
What is the greatest common divisor of 65 and another number?
The greatest common divisor of two numbers can be determined by comparing prime factorizations (factorizations in some texts) of the two numbers.
and taking the highest common prime factor. If there is no common factor, gcf is 1. This is also called the highest common factor and is part of the common prime factors of the two numbers.
This is the largest factor (largest number) that two numbers divide as the main factor.
The least common factor (least common number) of any pair of integers is 1.
How to find the least common multiple of 65 and another number?
We have a Least Common Multiple calculator. The solution is the least common multiple.
from two numbers.
What is a factor tree
A factor tree is a graphical representation of the possible factors of numbers and their subfactors. It is intended to simplify factorization.
It was created by
finding the factors of a number, then finding the factors of the factors of a number. Process continues recursively
until you get a set of prime factors, which is the factorization of the original number into prime factors.
When building a tree, be sure to remember the second element in the factor pair.
How to find factors of negative numbers? (e.g. 65)
To find the 65 factors, find all the positive factors (see above) and then duplicate them with
adding a minus sign in front of each one (actually multiplying them by 1). This removes the negative factors.
(handling negative integers)
Is 65 an integer?
Yes.
What are the rules for divisibility?
Divisibility means that the given integer is divisible by the given divisor. The Divisibility Rule is an abbreviation for
a system for determining what is divisible and what is not. This includes rules about odd and even numerical factors.
This example is intended to allow the student to evaluate the status of a given number without having to calculate.
What is the division of the number 65 into prime factors?
Why is prime factorization of 65 written as 5
^{ 1 } x 13 ^{ 1 } ?
What is prime factorization?
or prime factoring prime factoring is the process of determining which prime numbers can be multiplied together to get the original number.
Finding prime factors 65
To find prime factors, you start by dividing the number by the first prime number, which is 2. If here
is not a remainder of , so you can divide evenly, then 2 is the factor of the number. Keep dividing by 2 until you can no longer divide evenly. Write down how many twos you were able to evenly divide.
Now try to divide by the next prime factor, which is 3. The goal is to get the quotient, which is 1.
If it still doesn't make sense, let's try ...
Here are the first few prime factors: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29…
Let's start by dividing 65 by 2
65 ÷ 2 = 32.5 is the remainder. Let's try another prime number.
65 ÷ 3 = 21.6667 is the remainder. Let's try another prime number.
65 ÷ 5 = 13  without a trace! 5 is one of the factors!
13 ÷ 5 = 2.6  there is a remainder. We can no longer divide by 5 equally. Let's try the following prime number
13 ÷ 7 = 1.8571  It has a remainder. 7 doesn't matter.
13 ÷ 11 = 1.1818 is the remainder. 11 is not a factor.
13 ÷ 13 = 1  no remainder! 13 is one of the factors!
The orange divisor(s) above are the prime factors of 65. Adding it all together gives us the factors 5 x 13 = 65. This can also be written in exponential form as 5 ^{ 1 } x 13 ^{ 1 } .
Factor tree
Another way to perform prime factorization is to use a factor tree. Below is a factor tree for the number 65.
65  
5  13 
Other examples of prime factorization
Try odds calculator
Summing up65.
.
Here we have a collection of all the information you may need about the main factors of the number 65. We will provide you with
definition of prime factors 65, show you how to find prime factors 65 (simple factorization of 65), creating a tree of prime factors 65,
tell you how many prime factors 65 exist, and we will show you the product of prime factors 65.
prime factors 65 definitions
First note that all prime numbers are positive integers that can only be evenly divided by 1 and itself. Summing up 65.
all prime numbers that, when multiplied, equal 65.
How to find the prime factors 65
The process of finding the principal factors 65 is called simple factorization of 65. To get the principal factors 65, you divide 65 by the smallest.
is a possible prime number. You then take the result and divide it by the smallest prime number. Repeat this process until you get 1.
This primary factorization process creates what we call a 65 primary factor tree. See illustration below.
All prime numbers that are used to divide the prime factor tree are prime numbers.
Factors of 65. Here is the math to illustrate:
65 ÷ 5 = 13
13 ÷ 13 = 1
Again, all the primes you used to divide above are prime factors of 65. So prime factors of 65 equal:
5, 13.
How many basic factors equals 65?
When we count the number of primes above, we find that 65 has a total of 2 prime factors.
Product of principal factors 65
Prime factors 65 are unique to 65. If you multiply all prime factors 65 together, you get 65.
This is called the product of prime factors 65. The product of prime factors 65 is:
5 × 13 = 65
Prime factors calculator need basic factors for a specific number? You can enter the number below to find out the main factors
this number with detailed explanations, as we did with the main factors 65 above.
Summing up66
We hope you found this stepbystep guide to the main factors of the number 65 helpful. Do you want to take the test? If yes, try to find the main factors.
is the next number on our list, then check your answer here.
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What is a prime number?
Prime numbers are natural numbers (positive integers that sometimes include 0 in some definitions) greater than 1 that cannot be formed by multiplying two smaller numbers. An example of a prime number is 7, since it can only be formed by multiplying the numbers 1 and 7. Other examples include 2, 3, 5, 11, etc.
Numbers that can be formed by two other natural numbers greater than 1 are called composite numbers. Examples of this include numbers like, 4, 6, 9etc.
Prime numbers are widely used in number theory due to the fundamental theorem of arithmetic. This theorem states that natural numbers greater than 1 are either prime or can be decomposed as a product of primes. For example, the number 60 can be decomposed into a product of primes as follows:
60 = 5 × 3 × 2 × 2
As can be seen from example above, there are no composite numbers in factorization.
What is prime factorization?
Prime factorization is the decomposition of a composite number into a product of prime numbers. There are many factoring algorithms, some more complex than others.
Judicial Branch:
One of the methods for finding prime factors of a composite number is trial division. Trial division is one of the most basic algorithms, although very tedious. It involves testing each integer by dividing the composite number in question by the integer and determining if the integer can divide the number equally and how many times. As a simple example, below is prime factorization of 820 using trial division:
820 ÷ 2 = 410
410 ÷ 2 = 205
Since 205 is no longer divisible by 2, check the following integers. 205 cannot be divided by 3 without a remainder. 4 is not a prime number. However, it can be divided by 5:
.
205 ÷ 5 = 41
Since 41 is a prime number, this completes the trial division. Thus:
820 = 41 × 5 × 2 × 2
The product can also be written as:
820 = 41 × 5 × 2 ^{ 2 }
This is basically a brute force method for determining the prime factors of a number, and although 820 is a simple example, it can get a lot more tedious very quickly.
Prime factorization:
Another common way to perform prime factorization is called prime factorization and may involve the use of a factor tree. Building a factor tree involves factoring the composite number into the factors of the composite number until all numbers are prime. In the example below, prime factors are found by dividing 820 by a prime factor of 2 and then dividing the result until all factors are prime. The example below shows two ways to create a factor tree using the number 820:
.
So we can see that the factorization of the number 820 into prime factors in any case is again:
820 = 41 × 5 × 2 × 2
there is a known algorithm for much larger numbers, and even machines can take a long time to compute simple expansions of large numbers; In 2009, scientists completed a project using hundreds of machines to decompose the 232digit RSA768 number, a process that took two years.
Prime factorization of general numbers
Below are prime factorizations of some common numbers.
Prime factorization 2: prime number
Prime factorization 3: prime number
Prime factorization 4: 2 ^{ 2 }
Prime factorization 5: prime number
Prime factorization 6: 2 × 3
Prime factorization 7: prime number
Prime Factorization 8: 2 ^{ 3 }
Prime Factorization 9: 3 ^{ 2 }
Prime Factorization 10: 2 × 5
Prime Factorization 9002 factors 12: 2 ^{ 2 } × 3
Prime factorization 13: prime number
Prime factorization 14: 2 × 7
Prime factorization 15: 3 × 5
Prime factorization 16: 2 ^{ 4 }
Prime factorization 17: prime number
Prime factorization 18: 2 × 3 ^{ 2 }
Prime factorization 19: 9005 prime factors 20: 2 ^{ 2 } × 5
prime factorization 21: 3 × 7
prime factorization 22: 2 × 11
prime factorization 23: prime number
Decomposition for simple multipliers 24: 2 ^{ 3 } × 3
Distance for simple multipliers 25: 5 ^{ 2 }
Decomposition for simple multipliers 26: 2 × 13
Decomposition for simple multipliers 27: 3 ^{ 3 }
Prime factorization 28: 2 ^{ 2 } × 7
Prime factorization 29: prime number
Prime factorization 30: 2 × 3 × 5
Prime factorization 31: prime number
Prime factorization 32: 2 ^{ 5 }
Prime factorization 33: 3 × 11
Prime factorization 34: 2 × 17
Prime factorization 35: 5 × 7 902 prime factorization 35: 5 × 7 900 factors 36: 2 ^{ 2 } × 3 ^{ 2 }
Prime factorization 37: prime number
Prime factorization 38: 2 × 19
Prime factorization 39: 3 × 13
Prime Factorization 40: 2 ^{ 3 } × 5
Prime Factorization 41: Prime
Prime Factorization 42: 2 × 3 × 7
Prime Factorization 43 number
Prime factorization 44: 2 ^{ 2 } × 11
Prime factorization 45: 3 ^{ 2 } × 5
Prime factorization 46: 2 × 23
Prime factorization 48: 2 ^{ 4 } × 3
Prime factorization 49: 7 ^{ 2 }
Prime factorization 50: 2 × 5 ^{ 2 }
prime factors 5 17
Prime factorization 52: 2 ^{ 2 } × 13
Prime factorization 53: prime number
Prime factorization 54: 2 × 3 ^{ 3 }
prime factorization 5 × 15
Prime factorization 56: 2 ^{ 3 } × 7
Prime factorization 57: 3 × 19
Prime factorization 58: 2 × 29
Prime factorization 59: prime number 9002 superposition 9002 prime factors 60: 2 ^{ 2 } × 3 × 5
Prime factorization 61: prime number
Prime factorization 62: 2 × 31
Prime factorization 63: 3 ^{ 2 } × 7
Prime factorization 64: 2 ^{ 6 }
Prime factorization 65: 5 × 13
Prime factorization 66: 2 × 3 × 11
prime factors number
Prime factorization 68: 2 ^{ 2 } × 17
Prime factorization 69: 3 × 23
Prime factorization 70: 2 × 5 × 7
Prime factorization 710005
Prime factorization 72: 2 ^{ 3 } × 3 ^{ 2 }
Prime factorization 73: prime number
Prime factorization 74: 2 × 37
Prime factorization 5 2
Prime Factorization 76: 2 ^{ 2 } × 19
Prime Factorization 77: 7 × 11
Prime Factorization 78: 2 × 3 × 13
Prime Factorization 7: prime number
Prime factorization of 80: 2 ^{ 4 } × 5
Prime factorization of 81: 3 ^{ 4 }
Prime factorization of 82: 2 × 41
prime factorization of 82: 2 × 41
prime factorization
Prime Factorization 84: 2 ^{ 2 } × 3 × 7
Prime Factorization 85: 5 × 17
Prime Factorization 86: 2 × 43
Prime Factorization 3 × 29:
Prime factorization 88: 2 ^{ 3 } × 11
Prime factorization 89: prime number
Prime factorization 90: 2 × 3 ^{ 2 } × 5
13
Prime Factorization 92: 2 ^{ 2 } × 23
Prime Factorization 93: 3 × 31
Prime Factorization 94: 2 × 47
Prime Factorization 95: 5 × 19
Prime factorization 96: 2 ^{ 5 } × 3
Prime factorization 97: prime number
Prime factorization 98: 2 × 7 ^{ 2 }
prime factorization 9 : 3 ^{ 2 } × 11Prime factorization of 100: 2 ^{ 2 } × 5 ^{ 2 }
Prime factorization of 101: prime number
Prime factorization of
0005
Prime factorization 103: prime number
Prime factorization 104: 2 ^{ 3 } × 13
Prime factorization 105: 3 × 5 × 7 Prime Factorization 107: Prime Number
Prime Factorization 108: 2 ^{ 2 } × 3 ^{ 3 }
Prime Factorization 109: Prime Number
Prime Factorization 110: 1 ×
Prime factorization 111: 3 × 37
Prime factorization 112: 2 ^{ 4 } × 7
Prime factorization 113: prime number 115 Prime Factorization: 5 × 23
116 Prime Factorization: 2 ^{ 2 } × 29
117 Prime Factorization: 3 ^{ 2 } × 13
Prime Factorization 15:2
Prime factorization 119: 7 × 17
Prime factorization 120: 2 ^{ 3 } × 3 × 5
Prime factorization 121: 11 ^{ 2 }
prime factorsPrime factorization 123: 3 × 41
Prime factorization 124: 2 ^{ 2 } × 31
Prime factorization 125: 5 ^{ 3 }
0091 2 × 7
Prime factorization of 127: prime number
Prime factorization of 128: 2 ^{ 7 }
Prime factorization of 129: 3 × 1 13
Prime Factorization 131: Prime Number
Prime Factorization 132: 2 ^{ 2 } × 3 × 11
Prime Factorization 133: 7 × 19
Prime Factorization 13 : 20005
Prime factorization 135: 3 ^{ 3 } × 5
Prime factorization 136: 2 ^{ 3 } × 17
Prime factorization 137: prime number
23
Prime Factorization 139: Prime
Prime Factorization 140: 2 ^{ 2 } × 5 × 7
Prime Factorization 141: 3 × 47
5Prime Factorization 141: 3 × 47
50005
Prime factorization 143: 11 × 13
Prime factorization 144: 2 ^{ 4 } × 3 ^{ 2 }
Prime factorization 145: 5 × 29
prime factors 145: 5 × 29 900Prime factorization 147: 3 × 7 ^{ 2 }
Prime factorization 148: 2 ^{ 2 } × 37
Prime factorization 149: prime number
9002 5 ^{ 2 }Discharging for simple multipliers 200: 2 ^{ 3 } × 5 ^{ 2 }
Distance for simple multipliers 300: 2 ^{ 2 } × 3 × 5 ^{ 2 }
Decay for simple multipliers 400: 2 ^{ 4 } × 5 ^{ 2 }
Simple multipliers 500: 2 ^{ 2 } × 5 ^{ 3 }
Distribution for simple multipliers 600: 2 ^{ 3 } × 3 × 5 ^{ 2 }
Decomposition into simple multipliers 700: 700: 700: 2^{ 2 } × 5 ^{ 2 } × 7
Disability for simple multipliers 800: 2 ^{ 5 } × 5 ^{ 2 }
Disfusion for simple multipliers 900: 2 ^{ 2 } × 3 ^{ 2 } × 5 ^{ 2 }
Prime factorization of 1000: 2 ^{ 3 } × 5 ^{ 3 }
prime factorization 65  Summing up65
.
Use the form below to complete the conversion by separating the numbers with commas.
Factors  Summing up 65 = 5, 13  
Key factor tree of 65
The factor tree of 65 above shows the level of divisions performed to obtain factor values. Examine the tree to see incremental division 
Prime number factorization, or integer number factorization, is the definition of a set of intermediate prime numbers that are multiplied together to get the original integer. This is also known as prime factorization.
Factoring 65
We get the integer expansion of 65 by finding a list of primes that can divide the number, along with their multiplicities.
These are prime numbers that can divide 65 without a remainder. So the first number to take into account is 2
. Getting coefficients is done by dividing a number by numbers smaller in value to find the one that leaves no remainder. Numbers that are divided without a remainder are factors.
Prime factorization is different from prime numbers. Prime numbers are integers that can be divided by itself and 1. For example, 7 can be divided by itself and 1, so it's a prime number.
Integers that can be divided by other numbers are called composite numbers. Prme factorization is performed on composite numbers, not on prime numbers.
The first 10 prime integers are: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29
.
Factorization example
Let's say we want to find prime factors of 50. We start testing all integers to see how often they divide 50 and the subsequent resulting value. The resulting set of factors will be simple because, for example, when 2 is exhausted, all multiples of 2 will also be exhausted.
50 ÷ 2 = 25; save 2
25 ÷ 2 = 12.5, not an integer, so try the next largest number, 3
25 ÷ 3 = 8.333, not an integer, so try the next largest number, 4
25 ÷ 4 = 6.25, not an integer , so try the next largest number, 5
25 ÷ 5 = 5; save 5
5 ÷ 5 = 1; save 5
So 50 factors = 2 x 5 x 5 which is the same as 2 x 5 ^{ 2 }

Other Numeric Conversions to Consider
65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84
Goldendoodle boise
September 23, 2007 Boise. 1 decade ago. My family received our Goldendoodle in April when he was 10 weeks old. He is 8 months old and weighs 65 pounds. He is the cutest and cutest dog. ..
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Stingray Quality Issues
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