Calculator is Fun 对比 Abacus Adventure 1 的使用情况和统计数据

• Learn how to use abacus step by step. • Train your abacus skill with interesting games. • 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+.