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Master addition and subtraction with math whizzes Robin and Dob. Developed by a Math Ph.D student for his own kids. Designed to provide kids the foundation they need for more advanced math. Guaranteed to be fun and effective. Includes a cool diploma to share with family and friends! Special features: 10 levels for addition & bonus challenges. 10 levels for subtraction & bonus challenges. Unique, interactive tools. Automatic progress tracking for up to 4 customizable profiles."My daughter always thought math was boring until we came across Robin and Dob. Now she smiles while she's practicing her addition and subtraction." -- Marlis Zimmerman, Appracadabra