The factors of 81 are 1, 3, 9, 27, and 81.
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the factor rainbow of 4 is 1,2,4
1,2,3,4,6,8,9,12,18,24,36,72 factor of 72 1,3,9,27,and 81 is factor of 81
You do a factor rainbow to find a prime factorization. You compare prime factorizations to find a greatest common factor.
A factor = a number which can be divided into the given number with no remainder Yes. It's the only factor of 81 (apart from 9, 27 and 81 itself).
81 27,3 9,3,3 3,3,3,3