What is the GCF of 9 and 20?
The GCF of 9 and 20 is 1.
Steps to find GCF
- Find the prime factorization of 9
9 = 3 × 3 - Find the prime factorization of 20
20 = 2 × 2 × 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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Related
Find HCF of: 18 & 40 27 & 60 45 & 100 63 & 140 18 & 20 9 & 40 27 & 20 9 & 60 45 & 20 9 & 100 63 & 20 9 & 140
GCF Calculator
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The greatest common factor (GCF) is also known as greatest common divisor (GCD) or highest common factor (HCF).