GCF (HCF) of 21 and 42
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What is the Greatest Common Divisor of 21 and 42?
Answer
GCF (HCF) of 21 and 42 is
21
Common factors: 1, 3, 7, 21
21 divides 42 (42 ÷ 21 = 2), so the GCF is the smaller number itself.
21 = 3 × 7
42 = 2 × 3 × 7
| Prime | 21 | 42 | Lowest power |
|---|---|---|---|
| 2 | — | 2 | — |
| 3 | 3 | 3 | 3 |
| 7 | 7 | 7 | 7 |
— = power 0: the prime is not a factor of this number, so it cannot be in the GCF.
GCF = 3 × 7 = 21
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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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