7
Prime Factorization of:
28 = 2 * 2 * 7
35 = …………..7 * 5
56 = 2 * 2 * 7……..* 2
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GCF=…………..7
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LCM(56, 84) = 168 GCF(56, 84) = 28
The GCF is 28.
The LCM is 280.
28 is a factor of 56, and 28 is also a factor of itself. So the highest common factor of 28 and 56 is 28.
All factors of 35: 1, 5, 7, and 35.All factors of 56: 1, 2, 4, 7, 8, 14, 28, and 56.The only common factors of 35 and 56 are 1 and 7 .The greatest one is 7 .