7 times 21 is 147. In symbols: 7 × 21 = 147, and 21 × 7 = 147 too.
7 × 21 means adding 7 to itself 21 times: that is 21 copies of 7, which add up to 147.
7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, ... (keep going to the 21th multiple). The 21th multiple of 7 is 147.
7 × 21 = 7 × 20 + 7 × 1 = 140 + 7 = 147.
147 ÷ 7 = 21
147 ÷ 21 = 7
147 is odd. Prime factorization: 3 × 7 × 7.
| Multiplication | Answer |
|---|---|
| 6 × 21 | 126 |
| 8 × 21 | 168 |
| 7 × 20 | 140 |
| 7 × 22 | 154 |
| 7 × 23 | 161 |
| 7 × 19 | 133 |
| 9 × 21 | 189 |
| 5 × 21 | 105 |
See also: factors of 147.
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