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the factor rainbow of 4 is 1,2,4
Oh honey, a factor rainbow for 42? Let me break it down for you. The factors of 42 are 1, 2, 3, 6, 7, 14, 21, and 42. So, if you want to create a factor rainbow, just draw a rainbow and write those numbers in a nice little arc. Voila!
You do a factor rainbow to find a prime factorization. You compare prime factorizations to find a greatest common factor.
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.
43 is a prime number and doesn't have a rainbow because it only has one prime factor: itself.