9 times 11 is 99. In symbols: 9 × 11 = 99, and 11 × 9 = 99 too.
9 × 11 means adding 9 to itself 11 times: 9 + 9 + 9 + 9 + 9 + 9 + 9 + 9 + 9 + 9 + 9 = 99.
9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99. The 11th multiple of 9 is 99.
9 × 11 = 9 × 10 + 9 × 1 = 90 + 9 = 99.
99 ÷ 9 = 11
99 ÷ 11 = 9
99 is odd. Prime factorization: 3 × 3 × 11.
| Multiplication | Answer |
|---|---|
| 8 × 11 | 88 |
| 10 × 11 | 110 |
| 9 × 10 | 90 |
| 9 × 12 | 108 |
| 9 × 13 | 117 |
| 9 × 9 | 81 |
| 11 × 11 | 121 |
| 7 × 11 | 77 |
See also: factors of 99.
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