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Many people use factor trees.
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use a factor tree
If the prime factorization contains a 5 and a 7, 35 is a factor.
Use factor trees. 48 24,2 12,2,2 6,2,2,2 3,2,2,2,2 100 50,2 25,2,2 5,5,2,2
Use factor trees.355,7142,75 x 7 = 352 x 7 = 14Select the common factor.The GCF is 7.
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When you want to find the prime factorization of a composite number.
A factor tree.
Use a factor tree. 125 25,5 5,5,5
Use a factor tree. 310 155,2 31,5,2