1, 2, 5, 10. You could divide to find them. Or go buy a factos table.
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Factors of 30 are: 1, 2, 3, 5, 6, 10, 15, and 30. Factors of 40 are: 1, 2, 4, 5, 8, 10, 20, and 40. Find the greatest factor they both have in common. That is the greatest common factor.
Any number between 30 and 40 can be a factor. The common factors of 30 and 40 are 1, 2, 5 and 10.
if 30 and 40 count as in between it's 30 but otherwise the closest is 35 but the factors are 5,7 and technically 1. 1+5+7=13
Both.
36 does.