Solutions by everydaycalculation.com

The GCF of 56 and 45 is 1.

- Find the prime factorization of 56

56 = 2 × 2 × 2 × 7 - Find the prime factorization of 45

45 = 3 × 3 × 5 - To find the GCF, multiply all the prime factors common to both numbers:
*Note that there are no common prime factors.* - Therefore, GCF =
**1**(since 1 is a factor of every number)

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Find HCF of: 112 & 90 168 & 135 280 & 225 392 & 315 112 & 45 56 & 90 168 & 45 56 & 135 280 & 45 56 & 225 392 & 45 56 & 315

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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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