72 and 16 are divisible by 1, 2, 4, 8.
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72 Divide by two. 36,2 Divide by two. 18,2,2 Divide by two. 9,2,2,2 Divide by three. 3,3,2,2,2 Stop. 2 x 2 x 2 x 3 x 3 = 72
The GCF of 16 and 72 is 8. 16/72 can be reduced to 2/9
72 = 23 x 32 24 = 23 x 3 16 = 24 The LCM of 72, 24, and 16 is 24 x 32 = 144.
It is 8
Try it out! Divide 72 by 48, for example on a calculator. If you get a whole number, it is; otherwise it's not.