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In this activity, learners use number sense and mental math strategies to estimate the price of a sign.

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

In this math lesson, learners are given 15 chips and a number line labeled from 2-12.

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 math activity, learners create a magic turtle where all the rows, columns and diagonals add up to fifteen.