| With Backpack Subtraction the learning never stops. Just clip it to your bag and you can work on your subtraction wherever you are--on the bus, at home, anywhere! Lay down some problems tiles, write your answers, then flip the magnets to check your math--the answers are on the back. Erase and try again! Comes with magnets that cover 1's through 10's, challenge problems, and a dry erase pen. |
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