5 times 18 is 90. In symbols: 5 × 18 = 90, and 18 × 5 = 90 too.
5 × 18 means adding 5 to itself 18 times: that is 18 copies of 5, which add up to 90.
5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, ... (keep going to the 18th multiple). The 18th multiple of 5 is 90.
5 × 18 = 5 × 10 + 5 × 8 = 50 + 40 = 90.
Halve one number and double the other: 5 × 18 = 9 × 10 = 90.
90 ÷ 5 = 18
90 ÷ 18 = 5
90 is even. Prime factorization: 2 × 3 × 3 × 5.
| Multiplication | Answer |
|---|---|
| 4 × 18 | 72 |
| 6 × 18 | 108 |
| 5 × 17 | 85 |
| 5 × 19 | 95 |
| 5 × 20 | 100 |
| 5 × 16 | 80 |
| 7 × 18 | 126 |
| 3 × 18 | 54 |
See also: factors of 90.
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