The greatest common factor is 8.
(16 = 2 x 8, 24 = 3 x 8, 32 = 4 x 8)
To find a GCF for more than 2 numbers, multiply their common prime factors:
16 = 2 x 2 x 2 x 2
24 = 2 x 2 x 2 x 3
32 = 2 x 2 x 2 x 2 x 2
Common factors are 2 x 2 x 2 = 8
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