GCF (HCF) of 15 and 10
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What is the Greatest Common Divisor of 15 and 10?
Answer
GCF (HCF) of 15 and 10 is
5
Common factors: 1, 5
5 divides both: 15 ÷ 5 = 3, 10 ÷ 5 = 2 — and 3 and 2 share no factor but 1, so no larger number divides both.
15 = 3 × 5
10 = 2 × 5
| Prime | 15 | 10 | Lowest power |
|---|---|---|---|
| 2 | — | 2 | — |
| 3 | 3 | — | — |
| 5 | 5 | 5 | 5 |
— = power 0: the prime is not a factor of this number, so it cannot be in the GCF.
GCF = 5
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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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