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    NASA
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    In this activity (page 10 of PDF), learners approximate the area of the uppermost cross section of an impact crater using a variety of square grids. They conclude which angle of impact results in...

    $5 - $10 per student Ages 8 - 14 45 to 60 minutes
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    Utah Education Network
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    In this math lesson, learners play two different games to help them understand coordinates. First, learners read the book, "The Fly on the Ceiling," by Julie Glass. Then, learners play ...

    1 cent - $1 per group Ages 8 - 11 30 to 45 minutes