GCF and LCM of 3 and 9
The greatest common factor and least common multiple of 3 and 9.
GCF of 3 and 9
3
LCM of 3 and 9
9
How it works
Break each number into its prime factors:
- 3 = 3
- 9 = 3²
The GCF (3) multiplies the primes both share, at the lowest power each appears. The LCM (9) multiplies every prime that appears in either number, at the highest power — which is also 3 × 9 ÷ 3 = 9.
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 3 and 9?+
The greatest common factor (GCF) of 3 and 9 is 3 — the largest number that divides both 3 and 9 with no remainder.
What is the LCM of 3 and 9?+
The least common multiple (LCM) of 3 and 9 is 9 — the smallest number that both 3 and 9 divide into. It equals 3 × 9 ÷ GCF = 27 ÷ 3 = 9.