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To find the GCF of 3 numbers you first need to write them as their prime factors:

32 = 2x2x2x2x2

40 = 2x2x2x5

64 = 2x2x2x2x2x2

The next step is to identify any common factors. In this case, all three numbers have three 2s as prime factors. Multiply these together to find the GCF:

2x2x2 = 8

Thus the GCF of 32, 40 and 64 is 8.

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13y ago

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