5 times 20 is 100. In symbols: 5 × 20 = 100, and 20 × 5 = 100 too.
5 × 20 means adding 5 to itself 20 times: that is 20 copies of 5, which add up to 100.
5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, ... (keep going to the 20th multiple). The 20th multiple of 5 is 100.
5 × 20 = 5 × 20 = 100 = 100.
Halve one number and double the other: 5 × 20 = 10 × 10 = 100.
100 ÷ 5 = 20
100 ÷ 20 = 5
100 is even. Prime factorization: 2 × 2 × 5 × 5.
| Multiplication | Answer |
|---|---|
| 4 × 20 | 80 |
| 6 × 20 | 120 |
| 5 × 19 | 95 |
| 5 × 21 | 105 |
| 5 × 22 | 110 |
| 5 × 18 | 90 |
| 7 × 20 | 140 |
| 3 × 20 | 60 |
See also: factors of 100.
Other numbers? Browse the multiplication table, the squares and cubes or the exponent calculator.