2, 4 or 8
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Besides 39 and 1, what is one factor of 39?
Here are some factors of 16:1,2,4,8,16.A factor of a number is a number that when you multiply it with a number it will equal the other number for example 1 is a factor of 16 because 16x1=16.
There are no common factors of 8 and 25 besides one, so the greatest common factor of 8 and 25 is 1.
The factors of 13 are 1 and 13. The factors of 16 are 1, 2, 4, 8, and 16. The only common factor is 1. Therefore, 1 is the greatest common factor. This means 13 and 16 are relatively prime. 1, in whole numbers.
The greatest factor of 21 and 16 is 21, which is a factor of 21 but not of 16.