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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.

free Ages 11 - 14 45 to 60 minutes
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In this activity, learners explore how the area of Arctic sea ice has changed over recent years. First, learners graph the area of Arctic sea ice over time from 1979 to 2007.

free Ages 11 - 18 45 to 60 minutes
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In this activity, learners will predict the size of a giant scale model of a comb or other rectangular object, then make one. If you tripled the size of a dollar bill, could you sit on it?

1 cent - $1 per group Ages 6 - 14 45 to 60 minutes
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In this activity, learners take a turn contributing a closed figure made of six squares to a large grid; each must be different from all the others on the grid so far.

1 cent - $1 per group Ages 4 - 14 5 to 10 minutes
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In this activity, learners investigate the relative growth of lengths, areas, and volumes as cylinders are scaled up.

$1 - $5 per group Ages 8 - 14 1 to 2 hours
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This is an activity (on page 2 of the PDF under Surface Area Activity) about surface area to volume ratio.

$10 - $20 per group Ages 8 - 14 30 to 45 minutes
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In this online activity, learners will explore size estimation in one, two and three dimensions. Multiple levels of difficulty allow for progressive skill improvement.

free Ages 6 - adult 10 to 30 minutes
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In this activity, learners slide shapes to create unusual tiled patterns.

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