GCF (HCF) of 70 and 84
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What is the Greatest Common Divisor of 70 and 84?
Answer
GCF (HCF) of 70 and 84 is
14
Common factors: 1, 2, 7, 14
14 divides both: 70 ÷ 14 = 5, 84 ÷ 14 = 6 — and 5 and 6 share no factor but 1, so no larger number divides both.
70 = 2 × 5 × 7
84 = 22 × 3 × 7
| Prime | 70 | 84 | Lowest power |
|---|---|---|---|
| 2 | 2 | 22 | 2 |
| 3 | — | 3 | — |
| 5 | 5 | — | — |
| 7 | 7 | 7 | 7 |
— = power 0: the prime is not a factor of this number, so it cannot be in the GCF.
GCF = 2 × 7 = 14
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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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