FPB adalah..........

72 = 2^3 x 3^2
80 = 2^4 x 5

FPB = 2^3
        = 8

160 = 2^5 x 5
240 = 2^4 x 3 x 5
320 = 2^6 x 5

FPB = 2^4 x 5
        = 16 x 5
        = 80

1) 2 pangkat 3 x 3 pangkat 2
= 8 x 9
= 72

2) 2 pangkat 4 x 5
= 16 x 5
= 80