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