Math FighterPlay in browserHome › Math topics › Mental math tricks
Mental maths tricks
A handful of tricks makes many calculations much faster.
Turn practice into a fight – play Math Fighter in your browser, on Android or on iOS.
Play in browser Google Play App StoreTricks
- × 9: 9 × 47 = 10 × 47 − 47 = 423.
- × 5: multiply by 10, then halve: 48 × 5 = 480 ÷ 2 = 240.
- × 11: 14 × 11 = 140 + 14 = 154.
- × 25: 25 × 12 = a quarter of 1,200 = 300.
- + 99: add 100, subtract 1: 99 + 57 = 156.
Try it yourself
- 14 × 11 = ?
- 25 × 12 = ?
- 9 × 47 = ?
- 48 × 5 = ?
- 35 × 4 = ?
- 99 + 57 = ?
- 15 × 6 = ?
- 19 × 3 = ?
Show answers
- 14 × 11 = 154
- 25 × 12 = 300
- 9 × 47 = 423
- 48 × 5 = 240
- 35 × 4 = 140
- 99 + 57 = 156
- 15 × 6 = 90
- 19 × 3 = 57
Frequently asked questions
Do these tricks replace learning times tables?
No – they build on them. Know the basic facts first, then use tricks for bigger numbers.