GCF and LCM of 18 and 27
The greatest common factor and least common multiple of 18 and 27.
GCF of 18 and 27
9
LCM of 18 and 27
54
How it works
Break each number into its prime factors:
- 18 = 2 × 3²
- 27 = 3³
The GCF (9) multiplies the primes both share, at the lowest power each appears. The LCM (54) multiplies every prime that appears in either number, at the highest power — which is also 18 × 27 ÷ 9 = 54.
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Frequently asked questions
What is the GCF of 18 and 27?+
The greatest common factor (GCF) of 18 and 27 is 9 — the largest number that divides both 18 and 27 with no remainder.
What is the LCM of 18 and 27?+
The least common multiple (LCM) of 18 and 27 is 54 — the smallest number that both 18 and 27 divide into. It equals 18 × 27 ÷ GCF = 486 ÷ 9 = 54.