Descrição geral do jogo
Step by step, you can choose to fit your level.
It is not desirable to choose too high a step from the beginning.
It is important to train the easy one over and over again.
It may be useful for elementary and middle school students.
It is also useful for high school students who are often wrong in simple arithmetic.
It is important to train the easy one over and over again.
It may be useful for elementary and middle school students.
It is also useful for high school students who are often wrong in simple arithmetic.
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