5 x 5 = 25
2 x 2 x 7 = 28
3 x 3 x 5 = 45
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45 = 32 x 51
3 x 3 x 5
3^2 x 5
Prime factorization of 45 = 3x3x5Prime factorization of 60 = 2x2x3x5Prime factorization of 160 = 2x2x2x2x2x5Only common factors are 5 (and 1).Therefore GCF = 5.
45 Divide by three. 15,3 Divide by three. 5,3,3 Stop.