GCF and LCM of 60 and 80
The greatest common factor and least common multiple of 60 and 80.
GCF of 60 and 80
20
LCM of 60 and 80
240
How it works
Break each number into its prime factors:
- 60 = 2² × 3 × 5
- 80 = 2⁴ × 5
The GCF (20) multiplies the primes both share, at the lowest power each appears. The LCM (240) multiplies every prime that appears in either number, at the highest power — which is also 60 × 80 ÷ 20 = 240.
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Frequently asked questions
What is the GCF of 60 and 80?+
The greatest common factor (GCF) of 60 and 80 is 20 — the largest number that divides both 60 and 80 with no remainder.
What is the LCM of 60 and 80?+
The least common multiple (LCM) of 60 and 80 is 240 — the smallest number that both 60 and 80 divide into. It equals 60 × 80 ÷ GCF = 4800 ÷ 20 = 240.