18 times 18 is 324. In symbols: 18 × 18 = 324 (18 squared).
18 × 18 means adding 18 to itself 18 times: that is 18 copies of 18, which add up to 324.
18, 36, 54, 72, 90, 108, 126, 144, 162, 180, 198, 216, ... (keep going to the 18th multiple). The 18th multiple of 18 is 324.
18 × 18 = 18 × 10 + 18 × 8 = 180 + 144 = 324.
Halve one number and double the other: 18 × 18 = 9 × 36 = 324.
324 ÷ 18 = 18
324 is even and a perfect square. Prime factorization: 2 × 2 × 3 × 3 × 3 × 3.
| Multiplication | Answer |
|---|---|
| 17 × 18 | 306 |
| 18 × 19 | 342 |
| 18 × 20 | 360 |
| 16 × 18 | 288 |
See also: 18 squared.
Other numbers? Browse the multiplication table, the squares and cubes or the exponent calculator.