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3 x 3 x 5 = 45
2 x 2 x 2 x 7 = 56
No common prime factors, the GCF is 1.

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Q: What is the gcf for 45 and 56 using prime factorization?
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Prime factorization of 45 = 3x3x5Prime factorization of 60 = 2x2x3x5Prime factorization of 160 = 2x2x2x2x2x5Only common factors are 5 (and 1).Therefore GCF = 5.


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