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Learners display their findings after a study of surface area and volume. They build a mobile to show a commercially available box and a constructed cubical box of the same volume.

1 cent - $1 per student Ages 11 - 14 1 to 2 hours
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In this activity about the brain and sleep (on page 138 of the PDF), learners measure their resting breathing rates. Learners will discover that breathing frequencies vary amongst individuals.

1 cent - $1 per group Ages 8 - 18 45 to 60 minutes
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This activity explores the main algorithms that are used as the basis for searching on computers, using different variations on the game of battleships.

1 cent - $1 per group Ages 8 - adult 30 to 45 minutes
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In this activity, learners use squares to figure out how many border tiles are needed to enclose different areas.

1 cent - $1 per student Ages 6 - 14 10 to 30 minutes
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In this activity learners create patterns of hair beads.

1 cent - $1 per group Ages 4 - 11 30 to 45 minutes
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In this activity, learners walk the sides and interior angles of various polygons drawn on the playground. As they do so, learners practice rotating clockwise 180° and 360°.

1 cent - $1 per group Ages 11 - 18 5 to 10 minutes
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In this activity (on pages 41-47 of PDF), learners explore tesselating geometric patterns (repeated shapes, similar to the art of M.C. Escher).

1 cent - $1 per student Ages 4 - adult 45 to 60 minutes
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In this inquiry-based lesson, learners measure the biomass of trees, calculate the carbon stored by the trees, and use this information to create recommendations about using trees for carbon sequestra

1 cent - $1 per student Ages 11 - 14 1 to 2 hours
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In this math lesson, learners explore polynomial and rational function patterns.

1 cent - $1 per group Ages 14 - 18 45 to 60 minutes
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In this activity (on page 134 of the PDF), learners explore reaction time.

1 cent - $1 per group Ages 8 - 18 1 to 2 hours
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In this math activity, learners play a game similar to 20 Questions, in which learners must identify a secret number drawn from a bag.

1 cent - $1 per group Ages 4 - 8 5 to 10 minutes
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In this activity, learners build a paper stellated rhombic dodecahedron, a three-dimensional 12-pointed star.

1 cent - $1 per group Ages 11 - 14 1 to 2 hours
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In this math puzzle game, learners work together to use algebraic reasoning and fun clues for solving word puzzles.

1 cent - $1 per group Ages 8 - 14 45 to 60 minutes
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In this activity, learners use their feet to estimate distances. Learners calculate the distance of one step in centimeters by measuring 10 steps at a time to reduce measurement error.

1 cent - $1 per group Ages 11 - 14 10 to 30 minutes
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In this activity, learners calculate the width (horizontal diameter) of the blind spot on their retina. Learners make a blind spot tester using a piece of notebook paper.

1 cent - $1 per student Ages 11 - 18 5 to 10 minutes
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In this activity, learners practice counting and multiplication as they figure out how many animal body parts they have to examine as "Dr. Vet."

1 cent - $1 per group Ages 4 - 8 10 to 30 minutes
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In this activity, learners develop their understanding of combinations as they create as many different kinds of tostadas as possible.

1 cent - $1 per student Ages 8 - 11 10 to 30 minutes
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The popular sudoku puzzles use numbers, but the game could played with any set of 9 different objects!

1 cent - $1 per student Ages 8 - 14 45 to 60 minutes
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In this activity, learners explore scale by using building cubes to see how changing the length, width, and height of a three-dimensional object affects its surface area and its volume.

1 cent - $1 per student Ages 11 - 14 10 to 30 minutes
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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