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School Zone Subtraction 0-12 Flash Cards: 56 Cards, 1st Grade, 2nd Grade, Numbers 0-12, Differences, Early Math, Problem Solving, Subtraction Problems, Counting, Ages 6+ [School Zone, Joan Hoffman] on desertcart.com. *FREE* shipping on qualifying offers. School Zone Subtraction 0-12 Flash Cards: 56 Cards, 1st Grade, 2nd Grade, Numbers 0-12, Differences, Early Math, Problem Solving, Subtraction Problems, Counting, Ages 6+