Book (Practical) Education Calculation class for elementary school students

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Education
Parents and children are surprised! They are more good at arithmetic, and they like it better! Only children who can do arithmetic know it. Even the winners of the Arithmetic Olympics are moved and put into practice! You can speed up less than half the speed you have ever experienced - Full of amazing skills that are not taught in schools or cram schools! Over 30 secret skills in total are introduced focusing on 7 secrets.