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    Utah Education Network
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    In this math lesson, learners use fruit to learn about proportions and percentages. Learners compare the weights of the edible and non-edible portions of fruit. Learners practice using different...

    $5 - $10 per group Ages 11 - 14 45 to 60 minutes
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    The Exploratorium
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    In this activity, learners use rice grains to model the composition of the atmosphere of the Earth today and in 1880. Learners assemble the model while measuring percentages. This activity also...

    $1 - $5 per group Ages 11 - 18 1 to 2 hours
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    Twin Cities Public Television
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    In this activity, learners conduct a waste audit and use their findings to implement a plan for reducing trash. Learners measure trash, sort by categories (compostable, recyclable, etc.) and...

    $5 - $10 per group Ages 8 - 14 1 to 2 hours
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    The Exploratorium
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    In this activity, learners calculate the percentage of oxygen in the atmosphere by using steel wool's ability to rust. Learners measure the volume of a test tube with a small amount of steel...

    1 cent - $1 per student Ages 11 - 18 1 to 7 days
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    PBS
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    In this math lesson, learners apply the concepts of ratios and percentages to the distribution of letters contained in a box of Alphabits® cereal. Each learner is given a sample of cereal from the...

    $1 - $5 per group Ages 11 - 14 45 to 60 minutes
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    The Exploratorium
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    In this activity, learners create a model using metric measuring tapes and atmosphere composition data. Learners will investigate the major components of the atmosphere (nitrogen and oxygen) as...

    $1 - $5 per group Ages 11 - 18 45 to 60 minutes
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    IEEE
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    In this activity, learners explore accuracy and precision. Learners work in teams to design and build a “robotic basketball player” for the World Robot Basketball League (RBL) that can accurately...

    Over $20 per group Ages 8 - 18 2 to 4 hours
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    Twin Cities Public Television
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    This activity (on page 2 of the PDF under SciGirls Activity: Malformed Frogs) is a full inquiry investigation into using indicator species to assess the health of an environment. Groups of learners...

    Over $20 per group Ages 8 - 14 1 to 2 hours