🌺 Articles in this section are designed to solve the problems to find the value of a mystery.
🌺 Children must apply the knowledge of math to add, subtract, multiply, divide and combine the calculations to solve the problem.
🌺 Difficulty levels as well as the number of calculations is also increasing from operations plus or minus then to replicate, from level 1 to level 8.
🌺 Once completed, children can practice to improve the investment think and calculate their speed.
Last updated on 2016年07月20日
此版本包含小幅錯誤修正和一般改善。請更新至最新版本，以獲得最佳體驗。
