Mental arithmetic
This practice focuses on choosing a helpful strategy before calculating, not on doing every step the long way.
How to solve this
- For addition, combine friendly parts: 340 + 280 can be 300 + 200 and 40 + 80.
- For subtraction, compensation often helps: 900 − 470 is the same as 930 − 500.
- For multiplication and division with round numbers, remove the zeroes carefully, calculate the core fact, then restore the place value.
Examples
340 + 280
620
900 - 470
430
4800 ÷ 60
80
Practice problems with answers
Solve these problems on paper or out loud, then check the answer key. The online practice and the printable worksheet give a new set every time.
- 431 × 29 = ___
- 154 × 33 = ___
- 7 282 + 2 174 = ___
- 20 × 64 = ___
- 805 × 8 = ___
- 8 205 + 3 572 = ___
- 4 835 - 2 712 = ___
- 7 453 - 1 360 = ___
Show answers
- 12 499
- 5 082
- 9 456
- 1 280
- 6 440
- 11 777
- 2 123
- 6 093