Plus Minus Calculation

Add (and subtract) all numbers shown. For abacus or brain training.

You can practice mental calculation with this application. Add (and subtract) all numbers shown. Please use this to practice calculation or abacus and do brain training.

You can choice

1. the number of numbers shown

2. the range of numbers

3. whether numbers less than 0 are shown or not

4. the size of numbers

5. whether the result of calculation can be negative