4 times 20 is 80. In symbols: 4 × 20 = 80, and 20 × 4 = 80 too.
4 × 20 means adding 4 to itself 20 times: that is 20 copies of 4, which add up to 80.
4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, ... (keep going to the 20th multiple). The 20th multiple of 4 is 80.
4 × 20 = 4 × 20 = 80 = 80.
Halve one number and double the other: 4 × 20 = 2 × 40 = 80.
80 ÷ 4 = 20
80 ÷ 20 = 4
80 is even. Prime factorization: 2 × 2 × 2 × 2 × 5.
| Multiplication | Answer |
|---|---|
| 3 × 20 | 60 |
| 5 × 20 | 100 |
| 4 × 19 | 76 |
| 4 × 21 | 84 |
| 4 × 22 | 88 |
| 4 × 18 | 72 |
| 6 × 20 | 120 |
| 2 × 20 | 40 |
See also: factors of 80.
Other numbers? Browse the multiplication table, the squares and cubes or the exponent calculator.