72x10--Prime factorization is 2x2x2x2x3x3x5
72 divided by 8 = 9
72 divided by 9=8
8 x 9 = 72
9 x 8= 72
so 9 x 8= 72
72 divided by 9=8
8 x 9 = 72
9 x 8= 72
so 9 x 8= 72
72 = 1*72 = 2*36 = 3*24 = 4*18 = 6*12 = 8*9