GCF (HCF) of 6 and 15
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What is the Greatest Common Divisor of 6 and 15?
Answer
GCF (HCF) of 6 and 15 is
3
Common factors: 1, 3
3 divides both: 6 ÷ 3 = 2, 15 ÷ 3 = 5 — and 2 and 5 share no factor but 1, so no larger number divides both.
6 = 2 × 3
15 = 3 × 5
| Prime | 6 | 15 | Lowest power |
|---|---|---|---|
| 2 | 2 | — | — |
| 3 | 3 | 3 | 3 |
| 5 | — | 5 | — |
— = power 0: the prime is not a factor of this number, so it cannot be in the GCF.
GCF = 3
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See Also
- Least Common Multiple - Find the Least Common Multiple (LCM) of two numbers
- Greatest Common Factor of 3 Numbers - Find the Greatest Common Factor (GCF) of three numbers
- Least Common Multiple of 3 Numbers - Find the Least Common Multiple (LCM) of three numbers
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