Exercise Modes
Addition Only
Practice addition with positive numbers only.
No score yet
Subtraction Only
Practice subtraction — results stay positive.
No score yet
Mixed Operations
Random addition and subtraction combined.
No score yet
Signed Numbers
Full range — results can go negative.
No score yet
How these soroban exercises work
Each mode shows a series of numbers one after another. Start from the first number, apply each addition or subtraction to the running total, then type the final answer. Use the sliders to set the speed (seconds per number) and the number of operations before you start.
| Mode | Numbers used | Best for |
|---|---|---|
| Addition only | 1 to 50 | First practice of addition and carrying |
| Subtraction only | 1 to 30, total stays at 0 or above | Borrowing and friends of 10 in subtraction |
| Mixed operations | 1 to 60, total stays at 0 or above | Everyday mental arithmetic |
| Signed numbers | 1 to 80, total can become negative | Older learners working with negative numbers |
A sensible order
- Start with addition only, 5 operations and a slow speed (2 to 3 seconds).
- When you get several series right in a row, add operations before increasing speed.
- Move to subtraction only, then mixed operations.
- Try signed numbers only once negative numbers have been introduced at school.
Worked example (mixed): 12, +7, −5
The total goes from 12 to 19, then from 19 to 14. The answer is 14. If you lose track, slow the speed down or follow the series on a soroban.
Tips for better results
Accuracy comes first: a correct answer at 2 seconds per number is worth more than a guess at 0.5 seconds. Short sessions of 5 to 10 minutes, most days, give the best progress. Scores are saved so you can compare with your previous best.
To learn the bead movements behind these calculations, follow the learning path or practise on the virtual soroban. For printed practice, use the worksheets.