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Q: How do you use a factor tree to find the greatest common factor of 88?

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Find out about factors and factor trees.

You need at least two factor trees to find a GCF.

You must start with two numbers in order to find the greatest common factor of a set of numbers. The number 25 alone has no greatest common factor as their is no other number in order to have a factor in common with anything.

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Trees aren't necessary. The greatest common multiple of any set of numbers is always infinite.

29 is already prime. No tree. 87 3,29 Since there are no common prime factors, the GCF is 1.

235 5,47 273 3,91 3,7,13 No common prime factors. The GCF is 1.

50 25,2 5,5,2

8 4,2 2,2,2 18 9,2 3,3,2 The GCF is 2.

2,675 2,5,125 2,5,5,25 2,5,5,5,5

244 62 2 2 3909 103 3 2 5The only factors common to 24 and 90 are 2 and 3, so the greatest common factor is their product, 6.

153,5189,23,3,23 x 5 = 152 x 3 x 3 = 18Select the common factor.The GCF is 3.

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