My Book of Simple Subtraction (Kumon Series)by Kumon, Kumon Publishing
Kumon workbooks are based on the "Kumon Method", an educational philosophy that aims at unlocking the full learning potential of each individual child. The Kumon Method introduces learning concepts in an incremental, step-by-step approach, allowing children to master new skills easily and without anxiety or frustration. As a result, children gain confidence in their abilities and are motivated to learn on their own.
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