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You need at least two factor trees to find a GCF.
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.
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
The factors of 48 are 1,2,3,4,6,8,12,16,24 and 48. You need another set of factors to compare them with to find a GCF.