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In this math lesson, learners count and compare amounts of money less than or equal to one dollar.

$5 - $10 per group Ages 6 - 8 1 to 2 hours
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Learners investigate the concept of humidity by using a dry and wet sponge as a model. They determine a model for 100% humidity, a sponge saturated with water.

1 cent - $1 per group Ages 8 - 14 30 to 45 minutes
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In this food science activity, learners explore digestion and proteins by observing the action of meat tenderizer on luncheon meat.

$1 - $5 per group Ages 8 - 14 30 to 45 minutes
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This activity (on page 3 of the PDF under GPS: Baseball Activity) is a full inquiry investigation into how "bounciness" relates to the distance a ball will fly when hit off a batting tee.

$5 - $10 per group Ages 8 - 14 1 to 2 hours
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In this activity, learners conduct a simulation exercise related to public key encryption and try to intercept a message sent between two learners.

free Ages 11 - 18 30 to 45 minutes
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In this environmental science lesson, learners will examine the dangers of mercury and how humans contribute to growing mercury emissions on Earth.

$5 - $10 per group Ages 14 - 18 1 to 2 hours
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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 explore the different salinities of various sources of water by taste-testing.

$1 - $5 per group Ages 6 - 14 10 to 30 minutes
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In this activity, learners discover how to determine the distance to a lightning strike or nearby thunderstorm.

free Ages 6 - 14 5 to 10 minutes
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In this fun hands-on activity, learners whip up a batch of cyber-dough (play dough) using math for measurements.

$1 - $5 per student Ages 4 - 11 30 to 45 minutes
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As learners play this strategy game, they develop understanding of squares, area, and perimeter. On each turn, a player draws a line between two dots next to each other on the grid.

free Ages 4 - 14 10 to 30 minutes
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In this activity, young learners will explore shapes, textures, and geometries using household materials.

free Ages 4 - 8 10 to 30 minutes
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In this outdoor activity, learners investigate the relationship between the slope of a trail and soil erosion.

$10 - $20 per group Ages 8 - 18 45 to 60 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 use number sense and mental math strategies to estimate the price of a sign.

free Ages 6 - 11 10 to 30 minutes
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In this activity, learners will rate the day, a book, or something else on a scale from -2 to 2. This activity works well for groups of all ages.

free Ages 4 - 14 5 to 10 minutes
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In this math activity, learners create their own units of measurement by making noodle rulers. Learners practice estimating and measuring objects using the noodle rulers .

$1 - $5 per student Ages 4 - 8 10 to 30 minutes
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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 outdoor biology and math activity, learners estimate the size of a population of organisms too numerous to count.

$10 - $20 per group Ages 8 - 14 45 to 60 minutes
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This investigation provides learners with a hands-on activity that simulates the changing relationship of surface areas-to-volume for a growing cell.

$1 - $5 per group Ages 14 - 18 45 to 60 minutes