GCF (HCF) of 51 and 85
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What is the Greatest Common Divisor of 51 and 85?
Answer
GCF (HCF) of 51 and 85 is
17
Common factors: 1, 17
17 divides both: 51 ÷ 17 = 3, 85 ÷ 17 = 5 — and 3 and 5 share no factor but 1, so no larger number divides both.
51 = 3 × 17
85 = 5 × 17
| Prime | 51 | 85 | Lowest power |
|---|---|---|---|
| 3 | 3 | — | — |
| 5 | — | 5 | — |
| 17 | 17 | 17 | 17 |
— = power 0: the prime is not a factor of this number, so it cannot be in the GCF.
GCF = 17
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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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GCF Table
| Number 1 | Number 2 | GCF |
|---|---|---|
| 51 | 70 | 1 |
| 51 | 71 | 1 |
| 51 | 72 | 3 |
| 51 | 73 | 1 |
| 51 | 74 | 1 |
| 51 | 75 | 3 |
| 51 | 76 | 1 |
| 51 | 77 | 1 |
| 51 | 78 | 3 |
| 51 | 79 | 1 |
| 51 | 80 | 1 |
| 51 | 81 | 3 |
| 51 | 82 | 1 |
| 51 | 83 | 1 |
| 51 | 84 | 3 |
| 51 | 85 | 17 |
| 51 | 86 | 1 |
| 51 | 87 | 3 |
| 51 | 88 | 1 |
| 51 | 89 | 1 |
| 51 | 90 | 3 |
| 51 | 91 | 1 |
| 51 | 92 | 1 |
| 51 | 93 | 3 |
| 51 | 94 | 1 |
| 51 | 95 | 1 |
| 51 | 96 | 3 |
| 51 | 97 | 1 |
| 51 | 98 | 1 |
| 51 | 99 | 3 |