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Simple, effective, and fun math concept teaching tool! Each see-through manipulative teaches all combinations of addition and subtraction facts for a different number from 1 through 10. This set makes the commutative property of addition and subtraction fun and easy to understand. The correct number of beads is permanently sealed inside the see-through divice. Children shake it to get a new, correct combination each time. One side shows the addition equation, the other shows the corresponding subtraction equation. For grades Pre-K and up.
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