30 times 30 is 900. In symbols: 30 × 30 = 900 (30 squared).
30 × 30 means adding 30 to itself 30 times: that is 30 copies of 30, which add up to 900.
30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 360, ... (keep going to the 30th multiple). The 30th multiple of 30 is 900.
30 × 30 = 30 × 30 = 900 = 900.
Halve one number and double the other: 30 × 30 = 15 × 60 = 900.
900 ÷ 30 = 30
900 is even and a perfect square. Prime factorization: 2 × 2 × 3 × 3 × 5 × 5.
| Multiplication | Answer |
|---|---|
| 29 × 30 | 870 |
| 28 × 30 | 840 |
See also: 30 squared.
Other numbers? Browse the multiplication table, the squares and cubes or the exponent calculator.