First, you break the number into 2 multiples. Then you break them into 2 multiples until you only have prime numbers remain. Rewrite the prime #'s in the simplest form.
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16 8,2 4,2,2 2,2,2,2
Use factor trees.355,7142,75 x 7 = 352 x 7 = 14Select the common factor.The GCF is 7.
Use the following factor trees to determine the answer355, 7and637, 97, 3, 37 is the common factor of 35 and 63
204,52,2,5
81 27,3 9,3,3 3,3,3,3