3,13
39
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the factor rainbow of 4 is 1,2,4
You do a factor rainbow to find a prime factorization. You compare prime factorizations to find a greatest common factor.
Besides 39 and 1, what is one factor of 39?
To find the factor rainbow of 78, we first determine the factors of 78, which are 1, 2, 3, 6, 13, 26, 39, and 78. We then arrange these factors in a rainbow pattern, starting with 1 and 78 at the ends, and pairing factors that multiply together to equal 78, such as 2 and 39, 3 and 26, and 6 and 13. This visually represents the prime factorization of 78 as 2 x 3 x 13.
39 is.