Solutions by everydaycalculation.com

The gcf of 45 and 420 is 15.

- Find the prime factorization of 45

45 = 3 × 3 × 5 - Find the prime factorization of 420

420 = 2 × 2 × 3 × 5 × 7 - To find the gcf, multiply all the prime factors common to both numbers:

Therefore, GCF = 3 × 5 - GCF =
**15**

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Find hcf of: 90 & 840 135 & 1260 15 & 140 225 & 2100 9 & 84 315 & 2940 90 & 420 45 & 840 135 & 420 45 & 1260 225 & 420 45 & 2100 315 & 420 45 & 2940

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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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