Rapid Calculation app for iPhone and iPad

This Application is designed for Rapid Calculation practice. It is a good choice for keeping brain clear and sharp.

FEATURES
- Plus and minus calculation
- 3 Number digits available
- 3 Demonstration Speed(Slow, Normal and Fast)
- 5, 10 or 15 Questions to choose
- 3 kinds of Show Mode

It is simple but functional and easy to use.

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