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In this math activity, learners play a number game to explore the relationships between numbers, combinations, and the concept of equivalency.

In this math activity, learners play a game and use a variety of strategies to solve a hidden number problem (or missing factor). Learners practice their number and operations skills.

In this online activity, learners crack the special code imprinted on envelopes to help the U.S. Postal Service deliver the mail.