Calculating Vietnamese dong For Kids

This Application is for the practice of calculating Vietnamese dong (Đồng Việt Nam; VND) for kids.

Vietnamese dong banknotes can count by moving a finger.
Question comes out in random.
Smileys will be displayed if the correct answer.
Response results understandable for kids will be displayed.
Button will appear large, it has become easy to press even kids.
If you answer correctly you will earn badges.But it will be forfeited if an incorrect answer. It should improve kids' motivation.

On tablets of 10 inches or larger, coins are displayed in full size.

3 modes available.

[CHOICE mode]
Choice the correct amount of money.

[INPUT mode]
Input number the correct amount of money.

[PAYMENT mode]
Place the currency of the instructed amount of money on top of the tray.