Divide 40 by 1, 2, 4 and 5.
1, 2, 4, 5, 8, 10, 20, 40
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One way to determine the common factors is to find all the factors of the numbers and compare them. The factors of 15 are 1, 3, 5, and 15. The factors of 40 are 1, 2, 4, 5, 8, 10, 20, and 40. The common factors are 1 and 5. The greatest common factor is 5.
find all factors of 61
The prime numbers (factors) of 40 are: 2 and 5
Since 40 is a factor of 80, all of its factors are common.
Any number between 30 and 40 can be a factor. The common factors of 30 and 40 are 1, 2, 5 and 10.