GCF for 15, 45 and 100
"Greatest Common Factor of 3 Numbers" Calculator
What's the Greatest Common Factor (GCF) of 15, 45 and 100?
Answer
GCF of 15, 45 and 100 is
5
Common factors: 1, 5
5 divides all three: 15 ÷ 5 = 3, 45 ÷ 5 = 9, 100 ÷ 5 = 20 — and 3, 9 and 20 have no factor but 1 common to all of them, so no larger number divides all three.
15 = 3 × 5
45 = 32 × 5
100 = 22 × 52
| Prime | 15 | 45 | 100 | Lowest power |
|---|---|---|---|---|
| 2 | — | — | 22 | — |
| 3 | 3 | 32 | — | — |
| 5 | 5 | 5 | 52 | 5 |
— = power 0: the prime is not a factor of this number, so it cannot be in the GCF.
GCF = 5
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See Also
- Least Common Multiple of 3 Numbers - Find the Least Common Multiple (LCM) of three numbers
- Greatest Common Factor - Find the Greatest Common Factor (GCF) of two numbers
- Least Common Multiple - Find the Least Common Multiple (LCM) of two numbers
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GCF Table
| 1st | 2nd | 3rd | GCF |
|---|---|---|---|
| 15 | 45 | 85 | 5 |
| 15 | 45 | 86 | 1 |
| 15 | 45 | 87 | 3 |
| 15 | 45 | 88 | 1 |
| 15 | 45 | 89 | 1 |
| 15 | 45 | 90 | 15 |
| 15 | 45 | 91 | 1 |
| 15 | 45 | 92 | 1 |
| 15 | 45 | 93 | 3 |
| 15 | 45 | 94 | 1 |
| 15 | 45 | 95 | 5 |
| 15 | 45 | 96 | 3 |
| 15 | 45 | 97 | 1 |
| 15 | 45 | 98 | 1 |
| 15 | 45 | 99 | 3 |
| 15 | 45 | 100 | 5 |
| 15 | 45 | 101 | 1 |
| 15 | 45 | 102 | 3 |
| 15 | 45 | 103 | 1 |
| 15 | 45 | 104 | 1 |
| 15 | 45 | 105 | 15 |
| 15 | 45 | 106 | 1 |
| 15 | 45 | 107 | 1 |
| 15 | 45 | 108 | 3 |
| 15 | 45 | 109 | 1 |
| 15 | 45 | 110 | 5 |
| 15 | 45 | 111 | 3 |
| 15 | 45 | 112 | 1 |
| 15 | 45 | 113 | 1 |
| 15 | 45 | 114 | 3 |