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Rapid Calculation HD

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

You have to remember the numbers which flash on the screen quickly, and make out the result(plus or minus).

- 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.