The factors of 16 are:
1, 2, 4, 8, 16
The factors of 80 are:
1, 2, 4, 5, 8, 10, 16, 20, 40, 80
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The factors of 64 are:1, 2, 4, 8, 16, 32, 64The factors of 80 are:1, 2, 4, 5, 8, 10, 16, 20, 40, 80The common factors are:1, 2, 4, 8, 16
80
All numbers have factors. Some numbers have some of the same factors as other numbers. Multiples of numbers have all of the factors of numbers that are factors of them, plus some of their own. 32 is a multiple of 16 and will have all of its factors. 64 is a multiple of both 32 and 16 and will have all of their factors.
http://www.wolframalpha.com/input/?i=factors+of+80
16 and -5