Factors are numbers which divide another number exactly.
The factors of 11 are 1 and 11.
The factors of 15 are 1, 3, 5 and 15.
So the only common factor of 11 and 15 is 1.
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The common factors of 50 and 15 are 1 & 5.
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.
1 and 11
The common factors of 44 and 121 are: 1 and 11
The Common Factors of 10 and 15 are 1 and 5