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    The Exploratorium
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    In this activity, learners get hands-on experience with ratios and scaling while making their own jewelry out of recycled plastic containers. Learners will practice measuring area and volume as...

    free Ages 11 - 14 45 to 60 minutes
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    Twin Cities Public Television
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    In this engineering activity, learners examine bicycle mechanics and gear ratios. Learners determine which gears will help them bike a set course in the shortest amount of time.

    1 cent - $1 per group Ages 8 - 14 1 to 2 hours
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    Lawrence Hall of Science
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    This game teaches ratio and proportion by having learners make "salads" that combine three types of beans in different combinations. The recipes are written as word problems, such as ...

    1 cent - $1 per student Ages 8 - 14 10 to 30 minutes
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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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    American Museum of Natural History
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    In this activity, learners discover the importance of maps and scale as they work together to create a map of the classroom. The printable four-page PDF handout includes: a series of inquiry-based...

    free Ages 11 - 18 45 to 60 minutes
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    American Association for the Advancement of Science
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    Learners classify a variety of objects by their characteristics. They then design an experiment to determine which objects float or sink in water and add this characteristic to their classification...

    $5 - $10 per group Ages 8 - 11 45 to 60 minutes
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    PBS
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    In this math lesson, learners apply the concepts of ratio and proportion to the capture-recapture statistical procedure. Learners are given containers (the bay) and an unknown number of fish-shaped...

    $5 - $10 per group Ages 11 - 14 45 to 60 minutes
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    NASA
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    In this activity, learners explore the relative size of the Sun and Earth as well as the distance between them. Learners estimate the size of the Sun and Earth and then use scaled models to...

    1 cent - $1 per group Ages 6 - 18 5 to 10 minutes
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    Worcester Polytechnic Institute
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    Groups of learners are provided with a generic car base and an egg. Their mission: design a device/enclosure to protect the egg on or in the car as it rolls down a ramp with increasing slopes....

    Over $20 per group Ages 11 - 18 1 to 2 hours
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    The University of Texas McDonald Observatory
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    In this activity, learners explore the relative sizes and distances of objects in the solar system. Without being informed of the expected product, learners will make a Play-doh model of the Earth...

    $1 - $5 per group Ages 8 - 18 30 to 45 minutes

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