• Best mental arithmetic calculation apps.

36+49-26 = ? Can you do the math above in few seconds?
By using the abacus mental method, all the people can do it fast and accurately.

Abacus Adventure Features:
• Full tutorial of how to use abacus.
• Using the abacus method mentally, train up mental calculation in more systematic and faster way. You will be able to handle more complicated calculation in the future.
• 55 stages in this game, including all the training and tutorials. A normal course of abacus mental cost you $500 or more, you got to save a lot of money and time by using this amazing app.
• Unlocks the stages, save the princess, collect the coins and more fun!!

• This app is designed by qualified mental abacus teachers and tested by hundreds of students. Best for children age 5+.