9 times 19 is 171. In symbols: 9 × 19 = 171, and 19 × 9 = 171 too.
9 × 19 means adding 9 to itself 19 times: that is 19 copies of 9, which add up to 171.
9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99, 108, ... (keep going to the 19th multiple). The 19th multiple of 9 is 171.
9 × 19 = 9 × 10 + 9 × 9 = 90 + 81 = 171.
171 ÷ 9 = 19
171 ÷ 19 = 9
171 is odd. Prime factorization: 3 × 3 × 19.
| Multiplication | Answer |
|---|---|
| 8 × 19 | 152 |
| 10 × 19 | 190 |
| 9 × 18 | 162 |
| 9 × 20 | 180 |
| 9 × 21 | 189 |
| 9 × 17 | 153 |
| 11 × 19 | 209 |
| 7 × 19 | 133 |
See also: factors of 171.
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