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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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