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Addition and subtraction
Fast mental addition and subtraction is the base for everything else in maths.
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Play in browser Google Play App StoreMental addition
Split into tens and ones: 47 + 38 = 47 + 30 + 8 = 77 + 8 = 85. Round and adjust: 58 + 67 = 60 + 67 − 2 = 125.
Mental subtraction
Count up: for 92 − 49 count from 49 to 50 (1), to 92 (42): 43. Round and adjust: 304 − 128 = 304 − 130 + 2 = 176.
Try it yourself
- 47 + 38 = ?
- 125 + 76 = ?
- 58 + 67 = ?
- 236 + 198 = ?
- 92 − 49 = ?
- 304 − 128 = ?
- 500 − 263 = ?
- 1000 − 357 = ?
Show answers
- 47 + 38 = 85
- 125 + 76 = 201
- 58 + 67 = 125
- 236 + 198 = 434
- 92 − 49 = 43
- 304 − 128 = 176
- 500 − 263 = 237
- 1000 − 357 = 643
Frequently asked questions
How do I stop making carrying mistakes?
Line up the digits by place value and write the carry small above the next column. Check with the reverse operation.