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Great for teaching the relationship between +/- and x/?, (e.g.: 3+1=4 on one side, 4-1=3 on the reverse). Set of 180 classroom-sized cards. Measure 6-1/2" x 3-1/4" (16cm x 8cm). Double Combo Value Set includes one set of Addition/Subtraction and one set of Multiplication/Division for a total of 180 cards.
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