Solutions by everydaycalculation.com

The GCF of 30 and 20 is 10.

- Find the prime factorization of 30

30 = 2 × 3 × 5 - 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 × 5 - GCF =
**10**

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Find hcf of: 60 & 40 15 & 10 90 & 60 150 & 100 6 & 4 210 & 140 60 & 20 30 & 40 90 & 20 30 & 60 150 & 20 30 & 100 210 & 20 30 & 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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