To calculate the GCF you first need to split the numbers into their prime factors:
16=2x2x2x2
32=2x2x2x2x2
The next step is to identify the common factors in each. Both numbers use four 2s, so we take these 4 2s and work out the product:
2x2x2x2=16
Thus, the GCF of 16 and 32 is 16.
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