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    PBS
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    In this math lesson, learners are given 15 chips and a number line labeled from 2-12. They are instructed to place their 15 chips on the numbers which they think will represent the sums when two...

    free Ages 11 - 14 45 to 60 minutes
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    Twin Cities Public Television
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    This activity (on page 2 of the PDF under SciGirls Activity: Tug O' War) is a full inquiry investigation into tug-of-war physics. Groups of learners will test two tug-of-war strategies. Which...

    $10 - $20 per group Ages 8 - 14 2 to 4 hours