GCF (HCF) of 7 and 18
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What is the Greatest Common Divisor of 7 and 18?
Answer
GCF (HCF) of 7 and 18 is
1
Common factors: 1
Only 1 divides both: 7 and 18 share no prime factor.
Such numbers are called coprime (relatively prime); their LCM is just the product: 7 × 18 = 126.
7 — prime
18 = 2 × 32
| Prime | 7 | 18 | Lowest power |
|---|---|---|---|
| 2 | — | 2 | — |
| 3 | — | 32 | — |
| 7 | 7 | — | — |
— = 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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