A factor rainbow just shows the factors that make up that number. For example if you were looking fo the factors of 12 they would be 1 2 3 4 6 and 12. To make the rainbow part just draw lines from 1 to 12 from 2 to 6 from 3 to 4 . the factors for 15 are 1,3,5,and 15.
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The factor rainbow of 75 is: 1 and 75 3 and 25 5 and 15 Therefore, the factor rainbow of 75 is (1, 75), (3, 25), (5, 15).
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.
43 is a prime number and doesn't have a rainbow because it only has one prime factor: itself.
you do a factor rainbow.