GCF and LCM of 4 and 8
The greatest common factor and least common multiple of 4 and 8.
GCF of 4 and 8
4
LCM of 4 and 8
8
How it works
Break each number into its prime factors:
- 4 = 2²
- 8 = 2³
The GCF (4) multiplies the primes both share, at the lowest power each appears. The LCM (8) multiplies every prime that appears in either number, at the highest power — which is also 4 × 8 ÷ 4 = 8.
Try other numbers
Need a different pair? The LCM & GCF calculator computes the GCF and LCM for any two numbers.
Related pairs
Frequently asked questions
What is the GCF of 4 and 8?+
The greatest common factor (GCF) of 4 and 8 is 4 — the largest number that divides both 4 and 8 with no remainder.
What is the LCM of 4 and 8?+
The least common multiple (LCM) of 4 and 8 is 8 — the smallest number that both 4 and 8 divide into. It equals 4 × 8 ÷ GCF = 32 ÷ 4 = 8.