15 times 23 is 345. In symbols: 15 × 23 = 345, and 23 × 15 = 345 too.
15 × 23 means adding 15 to itself 23 times: that is 23 copies of 15, which add up to 345.
15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, ... (keep going to the 23th multiple). The 23th multiple of 15 is 345.
15 × 23 = 15 × 20 + 15 × 3 = 300 + 45 = 345.
345 ÷ 15 = 23
345 ÷ 23 = 15
345 is odd. Prime factorization: 3 × 5 × 23.
| Multiplication | Answer |
|---|---|
| 14 × 23 | 322 |
| 16 × 23 | 368 |
| 15 × 22 | 330 |
| 15 × 24 | 360 |
| 15 × 25 | 375 |
| 15 × 21 | 315 |
| 17 × 23 | 391 |
| 13 × 23 | 299 |
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