The factors for 80 are: 10, 8, 40, 2, 20, 4, 1, 80, 16 and 5.
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Since 40 is a factor of 80, all of its factors are common.
To find the common factors of 25 and 80, we first determine the factors of each number. The factors of 25 are 1, 5, and 25, while the factors of 80 are 1, 2, 4, 5, 8, 10, 16, 20, 40, and 80. The common factors shared by both numbers are 1 and 5. To find the sum of these common factors, we add them together: 1 + 5 = 6. Therefore, the sum of all the common factors of 25 and 80 is 6.
1 2 4 8 16 are all common factors
Composite factors of 80 : 4, 8, 10, 16, 20, 40, 80 Factors of 80: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80
The factors of 80 are: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80.