13 times 21 is 273. In symbols: 13 × 21 = 273, and 21 × 13 = 273 too.
13 × 21 means adding 13 to itself 21 times: that is 21 copies of 13, which add up to 273.
13, 26, 39, 52, 65, 78, 91, 104, 117, 130, 143, 156, ... (keep going to the 21th multiple). The 21th multiple of 13 is 273.
13 × 21 = 13 × 20 + 13 × 1 = 260 + 13 = 273.
273 ÷ 13 = 21
273 ÷ 21 = 13
273 is odd. Prime factorization: 3 × 7 × 13.
| Multiplication | Answer |
|---|---|
| 12 × 21 | 252 |
| 14 × 21 | 294 |
| 13 × 20 | 260 |
| 13 × 22 | 286 |
| 13 × 23 | 299 |
| 13 × 19 | 247 |
| 15 × 21 | 315 |
| 11 × 21 | 231 |
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