8 times 21 is 168. In symbols: 8 × 21 = 168, and 21 × 8 = 168 too.
8 × 21 means adding 8 to itself 21 times: that is 21 copies of 8, which add up to 168.
8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 88, 96, ... (keep going to the 21th multiple). The 21th multiple of 8 is 168.
8 × 21 = 8 × 20 + 8 × 1 = 160 + 8 = 168.
Halve one number and double the other: 8 × 21 = 4 × 42 = 168.
168 ÷ 8 = 21
168 ÷ 21 = 8
168 is even. Prime factorization: 2 × 2 × 2 × 3 × 7.
| Multiplication | Answer |
|---|---|
| 7 × 21 | 147 |
| 9 × 21 | 189 |
| 8 × 20 | 160 |
| 8 × 22 | 176 |
| 8 × 23 | 184 |
| 8 × 19 | 152 |
| 10 × 21 | 210 |
| 6 × 21 | 126 |
See also: factors of 168.
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