5 times 16 is 80. In symbols: 5 × 16 = 80, and 16 × 5 = 80 too.
5 × 16 means adding 5 to itself 16 times: that is 16 copies of 5, which add up to 80.
5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, ... (keep going to the 16th multiple). The 16th multiple of 5 is 80.
5 × 16 = 5 × 10 + 5 × 6 = 50 + 30 = 80.
Halve one number and double the other: 5 × 16 = 8 × 10 = 80.
80 ÷ 5 = 16
80 ÷ 16 = 5
80 is even. Prime factorization: 2 × 2 × 2 × 2 × 5.
| Multiplication | Answer |
|---|---|
| 4 × 16 | 64 |
| 6 × 16 | 96 |
| 5 × 15 | 75 |
| 5 × 17 | 85 |
| 5 × 18 | 90 |
| 5 × 14 | 70 |
| 7 × 16 | 112 |
| 3 × 16 | 48 |
See also: factors of 80.
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