GCF and LCM of 2 and 4
The greatest common factor and least common multiple of 2 and 4.
GCF of 2 and 4
2
LCM of 2 and 4
4
How it works
Break each number into its prime factors:
- 2 = 2
- 4 = 2²
The GCF (2) multiplies the primes both share, at the lowest power each appears. The LCM (4) multiplies every prime that appears in either number, at the highest power — which is also 2 × 4 ÷ 2 = 4.
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Frequently asked questions
What is the GCF of 2 and 4?+
The greatest common factor (GCF) of 2 and 4 is 2 — the largest number that divides both 2 and 4 with no remainder.
What is the LCM of 2 and 4?+
The least common multiple (LCM) of 2 and 4 is 4 — the smallest number that both 2 and 4 divide into. It equals 2 × 4 ÷ GCF = 8 ÷ 2 = 4.