15 times 27 is 405. In symbols: 15 × 27 = 405, and 27 × 15 = 405 too.
15 × 27 means adding 15 to itself 27 times: that is 27 copies of 15, which add up to 405.
15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, ... (keep going to the 27th multiple). The 27th multiple of 15 is 405.
15 × 27 = 15 × 20 + 15 × 7 = 300 + 105 = 405.
405 ÷ 15 = 27
405 ÷ 27 = 15
405 is odd. Prime factorization: 3 × 3 × 3 × 3 × 5.
| Multiplication | Answer |
|---|---|
| 14 × 27 | 378 |
| 16 × 27 | 432 |
| 15 × 26 | 390 |
| 15 × 28 | 420 |
| 15 × 29 | 435 |
| 15 × 25 | 375 |
| 17 × 27 | 459 |
| 13 × 27 | 351 |
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