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    Featured Lesson Plan

    Construct, calculate, and have fun with this grades 6–12 lesson.

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    Featured Mobile Game

    Deep Sea Duel has been upgraded! Check it out in the iTunes store.

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    Featured Interactive

    Use this tool grades 3–6 game to explore factors by yourself or with a friend.

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    Featured Brain Teaser

    Make a square with 9 dots as shown. Cross all the dots with 4 straight lines without taking your pencil off the paper.

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