GCF (HCF) of 15 and 38
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What is the Greatest Common Divisor of 15 and 38?
Answer
GCF (HCF) of 15 and 38 is
1
Common factors: 1
Only 1 divides both: 15 and 38 share no prime factor.
Such numbers are called coprime (relatively prime); their LCM is just the product: 15 × 38 = 570.
15 = 3 × 5
38 = 2 × 19
| Prime | 15 | 38 | Lowest power |
|---|---|---|---|
| 2 | — | 2 | — |
| 3 | 3 | — | — |
| 5 | 5 | — | — |
| 19 | — | 19 | — |
— = power 0: the prime is not a factor of this number, so it cannot be in the GCF.
GCF = 1
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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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