Big Subtraction can help you improve your problem solving speed and accuracy for multi digit subtraction problems.

Larger problems are unlocked by solving smaller problems.

You can analyze your problem areas with both numerical and color-coded display of your results.

Stay motivated by setting and beating your fastest times.

Find your best rhythm by turning off/on any combination of verbal, sound, and vibration feedback.

This is a free-to-download, ad-supported app.

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