28 times 28 is 784. In symbols: 28 × 28 = 784 (28 squared).
28 × 28 means adding 28 to itself 28 times: that is 28 copies of 28, which add up to 784.
28, 56, 84, 112, 140, 168, 196, 224, 252, 280, 308, 336, ... (keep going to the 28th multiple). The 28th multiple of 28 is 784.
28 × 28 = 28 × 20 + 28 × 8 = 560 + 224 = 784.
Halve one number and double the other: 28 × 28 = 14 × 56 = 784.
784 ÷ 28 = 28
784 is even and a perfect square. Prime factorization: 2 × 2 × 2 × 2 × 7 × 7.
| Multiplication | Answer |
|---|---|
| 27 × 28 | 756 |
| 28 × 29 | 812 |
| 28 × 30 | 840 |
| 26 × 28 | 728 |
See also: 28 squared.
Other numbers? Browse the multiplication table, the squares and cubes or the exponent calculator.