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Factor trees are ways of notating the prime factorizations of composite numbers. Once you have the prime factorization, you can find the GCF.
Example: 30 and 42
30
15,2
5,3,2
42
21,2
7,3,2
2 x 3 x 5 = 30
2 x 3 x 7 = 42
Select the common factors.
2 x 3 = 6, the GCF
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Here is another example. Since the greatest common factor of two or more numbers is the product of all of the prime factors that they have in common, first we break the numbers down to their prime factors. Consider, for example, 5940 and 5544:
5940 = 22 x 33 x 5 x 11
5544 = 23 x 32 x 7 x 11
All of the prime factors that the numbers have in common are
22 x 32 x 11
which equals 396, so 396 is the greatest common factor of 5940 and 5544.
Wiki User
∙ 10y ago
Wiki User
∙ 11y agoExample: 30 and 42
2 x 3 x 5 = 30
2 x 3 x 7 = 42
Select the common factors.
2 x 3 = 6, the GCF
Wiki User
∙ 12y agoAll you do is a factor tree and use the prime numbers that nopth numbers have and multiply..... 94 x 76.......
Kimi03
Wiki User
∙ 11y agoExample: 30 and 42
2 x 3 x 5 = 30
2 x 3 x 7 = 42
2 x 3 = 6, the GCF
Wiki User
∙ 11y agoExample: 30 and 42
2 x 3 x 5 = 30
2 x 3 x 7 = 42
Select the common factors.
2 x 3 = 6, the GCF
Wiki User
∙ 11y agoIt doesn't matter what you use; you need more than one term to find a GCF.
Wiki User
∙ 12y agoExample: 30 and 42
2 x 3 x 5 = 30
2 x 3 x 7 = 42
Select the common factors.
2 x 3 = 6, the GCF
Wiki User
∙ 11y agoExample: 30 and 42
2 x 3 x 5 = 30
2 x 3 x 7 = 42
Combine the factors, eliminating duplicates.
2 x 3 x 5 x 7 = 210, the LCM
Wiki User
∙ 8y agoExample: 30 and 42
Factor them.
2 x 3 x 5 = 30
2 x 3 x 7 = 42
Select the common factors.
2 x 3 = 6, the GCF
Add your answer:
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When do you use a factor tree?
When you want to find the prime factorization of a composite number.
What is the greatest common factor of 24X-3?
It is not possible to give a sensible answer to this question. The greatest common factor (GCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question!
How do you find the prime factorization of 690?
Use a factor tree. 690 345,2 115,3,2 23,5,3,2
When do you use GCF and LCM?
Gcf you use when you are finding the greatest factor for the numbers. Lcm you use when you are finding the smallest multiple in the numbers factors
Use a division ladder to find the greatest common factor of 22 and 60?
22 11,2 There are no elevens in 60, so the GCF has to be 2.
How do you simplify fractions using the factor tree?
To simplify fractions, it is necessary to divide the numerator and the denominator by their GCF. You can find their GCF by comparing their prime factorizations. You can find their prime factorizations through the use of factor trees.
How do you use the factor tree to find the greatest common factor of 8 and 18?
8 4,2 2,2,2 18 9,2 3,3,2 The GCF is 2.
How do you use a factor tree to find the greatest common factor of 88?
A factor tree will show you the prime factorization of 88. Comparing that prime factorization of 88 and another number will you show you the GCF between the two. You need at least two numbers to find a GCF.
What happens if the slide ladder does not work for the GCF and LCM?
you have to use a factor tree
What is the GCF of 40 and 100?
The Greatest Common Factor of 40 and 100 is 20. 5x2x2. Use a factor tree and learn math!!!!!!!!!!!!!!
How do you use a factor tree to find the greatest common factor of 87 and 29?
It's not necessary for two reasons. First, 29 is a factor of 87 so it will automatically be the GCF of this problem. Second, since factor trees are designed to find prime numbers and 29 is already prime, it doesn't have a tree. But if you insist... 87 3,29 Here we have a factor tree, more like a factor shrub, that shows that the prime factors of 87 are 3 and 29. Since 29 is a factor of 29, the GCF is 29.
How do you use a factor tree to find the greatest common factor of 78 and 195?
Find out about factors and factor trees.
How do you find prime factor of 55?
Use a factor tree. 55 5,11
Do you use least common factor or greatest common factor to find equivalent fractions?
Use the GCF. The LCF is always 1.
How do you use the Greatest common factor to find out how many tiles you have in all?
You cannot use the GCF for this purpose.
How do you use a factor tree to find the greatest common factor of 56 and 96?
56 28,2 14,2,2 7,2,2,2 96 48,2 24,2,2 12,2,2,2 6,2,2,2,2 3,2,2,2,2,2 2 x 2 x 2 = 8, the GCF
How do you find GCF and LCM?
To find the GCF and the LCM you have to first at least try to use prime factorization. So use factor trees. Or for the LCM find th least common multiples of the number.
