GCF (HCF) of 81 and 49
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What is the Greatest Common Divisor of 81 and 49?
Answer
GCF (HCF) of 81 and 49 is
1
Common factors: 1
Only 1 divides both: 81 and 49 share no prime factor.
Such numbers are called coprime (relatively prime); their LCM is just the product: 81 × 49 = 3,969.
81 = 34
49 = 72
| Prime | 81 | 49 | Lowest power |
|---|---|---|---|
| 3 | 34 | — | — |
| 7 | — | 72 | — |
— = 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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GCF Table
| Number 1 | Number 2 | GCF |
|---|---|---|
| 81 | 34 | 1 |
| 81 | 35 | 1 |
| 81 | 36 | 9 |
| 81 | 37 | 1 |
| 81 | 38 | 1 |
| 81 | 39 | 3 |
| 81 | 40 | 1 |
| 81 | 41 | 1 |
| 81 | 42 | 3 |
| 81 | 43 | 1 |
| 81 | 44 | 1 |
| 81 | 45 | 9 |
| 81 | 46 | 1 |
| 81 | 47 | 1 |
| 81 | 48 | 3 |
| 81 | 49 | 1 |
| 81 | 50 | 1 |
| 81 | 51 | 3 |
| 81 | 52 | 1 |
| 81 | 53 | 1 |
| 81 | 54 | 27 |
| 81 | 55 | 1 |
| 81 | 56 | 1 |
| 81 | 57 | 3 |
| 81 | 58 | 1 |
| 81 | 59 | 1 |
| 81 | 60 | 3 |
| 81 | 61 | 1 |
| 81 | 62 | 1 |
| 81 | 63 | 9 |