Solutions by everydaycalculation.com

The GCF of 4 and 20 is 4.

- Find the prime factorization of 4

4 = 2 × 2 - Find the prime factorization of 20

20 = 2 × 2 × 5 - To find the GCF, multiply all the prime factors common to both numbers:

Therefore, GCF = 2 × 2 - GCF =
**4**

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Find hcf of: 8 & 40 2 & 10 12 & 60 20 & 100 28 & 140 8 & 20 4 & 40 12 & 20 4 & 60 20 & 20 4 & 100 28 & 20 4 & 140

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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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