## Get Started

- Download the recent version of the APK file from GitHub.
- Install the APK file on your Android smart phone or tablet. You should allow the installation of third party apps.
- Input your answer to the edit box, and push the '
**Submit**' button. You will see '*Correct*' or '*Answer is*' with the correct answer. Note that, in all division problem, the answer should be an**integer**floored from the fraction. - Click the '
**Next**' button to move forward to the next problem. - The total score increases whenever you input the correct answer while the total score decreases when a wrong answer was submitted.
- Click '
**Clear**' to restart the game. Both score and count are initialized.

## Level

**Level 1 (Easy)**: The numbers are limited from 2 to 9.**Level 2 (Medium)**: The numbers are limited from 2 to 20.**Level 3 (Advanced)**: The numbers are limited from 2 to 99.

## Mode

**Random**: The operations are assigned randomly.**Addition**: only addition.**Subtraction**: only subtraction.**Multiplication**: only multiplication.**Division**: only division.