Question

what is the greatest common factor of 28 and 32

Answer 1

4

28/4=7
32/4=8

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Answer 2

4

28 ÷ 4 = 7
32 ÷ 4 = 8

As 28 ÷ 4 equals an odd number, it cannot go into 8, because that would be a decimal number. Also, 28 ÷ 6 = 4.66 (a decimal). So it can't be anything other than 4.