15 times 28 is 420. In symbols: 15 × 28 = 420, and 28 × 15 = 420 too.
15 × 28 means adding 15 to itself 28 times: that is 28 copies of 15, which add up to 420.
15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, ... (keep going to the 28th multiple). The 28th multiple of 15 is 420.
15 × 28 = 15 × 20 + 15 × 8 = 300 + 120 = 420.
Halve one number and double the other: 15 × 28 = 14 × 30 = 420.
420 ÷ 15 = 28
420 ÷ 28 = 15
420 is even. Prime factorization: 2 × 2 × 3 × 5 × 7.
| Multiplication | Answer |
|---|---|
| 14 × 28 | 392 |
| 16 × 28 | 448 |
| 15 × 27 | 405 |
| 15 × 29 | 435 |
| 15 × 30 | 450 |
| 15 × 26 | 390 |
| 17 × 28 | 476 |
| 13 × 28 | 364 |
Other numbers? Browse the multiplication table, the squares and cubes or the exponent calculator.