Solutions by everydaycalculation.com

The GCF of 28 and 77 is 7.

- Find the prime factorization of 28

28 = 2 × 2 × 7 - Find the prime factorization of 77

77 = 7 × 11 - To find the GCF, multiply all the prime factors common to both numbers:

Therefore, GCF = 7

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Find hcf of: 56 & 154 84 & 231 140 & 385 196 & 539 4 & 11 56 & 77 28 & 154 84 & 77 28 & 231 140 & 77 28 & 385 196 & 77 28 & 539

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The greatest common factor (GCF) is also known as greatest common divisor (GCD) or highest common factor (HCF).

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