3 times 27 is 81. In symbols: 3 × 27 = 81, and 27 × 3 = 81 too.
3 × 27 means adding 3 to itself 27 times: that is 27 copies of 3, which add up to 81.
3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ... (keep going to the 27th multiple). The 27th multiple of 3 is 81.
3 × 27 = 3 × 20 + 3 × 7 = 60 + 21 = 81.
81 ÷ 3 = 27
81 ÷ 27 = 3
81 is odd. Prime factorization: 3 × 3 × 3 × 3.
| Multiplication | Answer |
|---|---|
| 2 × 27 | 54 |
| 4 × 27 | 108 |
| 3 × 26 | 78 |
| 3 × 28 | 84 |
| 3 × 29 | 87 |
| 3 × 25 | 75 |
| 5 × 27 | 135 |
See also: factors of 81.
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