7,2,2,2
14,2,2
28,2
56
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the factor rainbow of 4 is 1,2,4
no 6 is not a factor of 56
You do a factor rainbow to find a prime factorization. You compare prime factorizations to find a greatest common factor.
The GCF/HCF of 35 and 56 is 7.7The GCF is 7.The GCF is 7.
43 is a prime number and doesn't have a rainbow because it only has one prime factor: itself.