8 because 64/72 = 8/9
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8
72 / 64 = 1 r 8 64 / 8 = 8 r 0 GCF of 72 and 64 is 8.
(72 - 64)/72 x 100 = 11.1 recurring (that is, 11.1111...) percent.
The Greatest Common Factor (GCF) of 64 and 72 is 8.
The lowest common multiple of 64 and 72 is 576. Therefore, the common multiples of 64 and 72 are the multiples of 576. The first five are as follows: 576 1152 1728 2304 2880