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Method of prime factorization is one of the best method to find out greatest common factor.

Prime factorization of 32 = 2x2x2x2x2

Prime factorization of 8 = 2x2x2

Prime factorization of 40 = 2x2x2x5

2x2x2 is a factor of each number. Also, it is the greatest number which divides 32, 8 and 40. So, gcf is 8.

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14y ago

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