kids do maths

このゲームは、小数のsysで減算演算、加算を行うために子供たちを助けます

When you study about numbers, they include these Operations: Addition, subtraction. You must remember ways to do arithmetic if there's addends forming in a positive or negative. You will have the sum of 2 addends or of inverse, the difference of 2 minuennd and subtrahend with note of change-marker, which called complement in machine calculation.

Enjoy the game!