9 times 21 is 189. In symbols: 9 × 21 = 189, and 21 × 9 = 189 too.
9 × 21 means adding 9 to itself 21 times: that is 21 copies of 9, which add up to 189.
9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99, 108, ... (keep going to the 21th multiple). The 21th multiple of 9 is 189.
9 × 21 = 9 × 20 + 9 × 1 = 180 + 9 = 189.
189 ÷ 9 = 21
189 ÷ 21 = 9
189 is odd. Prime factorization: 3 × 3 × 3 × 7.
| Multiplication | Answer |
|---|---|
| 8 × 21 | 168 |
| 10 × 21 | 210 |
| 9 × 20 | 180 |
| 9 × 22 | 198 |
| 9 × 23 | 207 |
| 9 × 19 | 171 |
| 11 × 21 | 231 |
| 7 × 21 | 147 |
See also: factors of 189.
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