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12 = 2 x 2 x 3; 20 = 2 x 2 x 5; 32 = 2 x 2 x 2 x 2 x 2.

Common factors = 2 x 2 so HCF = 4

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14y ago
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Q: What is the greatest Common Factor of 12 and 20 and 32?
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