10 times 21 is 210. In symbols: 10 × 21 = 210, and 21 × 10 = 210 too.
10 × 21 means adding 10 to itself 21 times: that is 21 copies of 10, which add up to 210.
10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ... (keep going to the 21th multiple). The 21th multiple of 10 is 210.
10 × 21 = 10 × 20 + 10 × 1 = 200 + 10 = 210.
Halve one number and double the other: 10 × 21 = 5 × 42 = 210.
210 ÷ 10 = 21
210 ÷ 21 = 10
210 is even. Prime factorization: 2 × 3 × 5 × 7.
| Multiplication | Answer |
|---|---|
| 9 × 21 | 189 |
| 11 × 21 | 231 |
| 10 × 20 | 200 |
| 10 × 22 | 220 |
| 10 × 23 | 230 |
| 10 × 19 | 190 |
| 12 × 21 | 252 |
| 8 × 21 | 168 |
Other numbers? Browse the multiplication table, the squares and cubes or the exponent calculator.