21 times 25 is 525. In symbols: 21 × 25 = 525, and 25 × 21 = 525 too.
21 × 25 means adding 21 to itself 25 times: that is 25 copies of 21, which add up to 525.
21, 42, 63, 84, 105, 126, 147, 168, 189, 210, 231, 252, ... (keep going to the 25th multiple). The 25th multiple of 21 is 525.
21 × 25 = 21 × 20 + 21 × 5 = 420 + 105 = 525.
525 ÷ 21 = 25
525 ÷ 25 = 21
525 is odd. Prime factorization: 3 × 5 × 5 × 7.
| Multiplication | Answer |
|---|---|
| 20 × 25 | 500 |
| 22 × 25 | 550 |
| 21 × 24 | 504 |
| 21 × 26 | 546 |
| 21 × 27 | 567 |
| 21 × 23 | 483 |
| 23 × 25 | 575 |
| 19 × 25 | 475 |
Other numbers? Browse the multiplication table, the squares and cubes or the exponent calculator.