The overall difficulty level is so that elementary school students can enjoy it, and play and enjoy the four rules operation as a game. Main Features ● 19 training modes available 19 training modes are provided using basic four-pronged operations (+, -, x, /). Practice my deficiencies and complete the training, from addition and subtraction to multiplication and complex computation questions. ● An exciting main game It is a game that records higher scores in a limited time based on 19 types o