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In this activity, learners explore the size and scale of dinosaurs. Learners listen to "Dinosaurs, Dinosaurs" by Byron Barton to understand some background information about dinosaurs.

$1 - $5 per group Ages 6 - 8 45 to 60 minutes
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In this math activity, learners read "The Button Box" by Margarette S. Reid and then make their own button boxes filled with different buttons.

$5 - $10 per group Ages 6 - 8 1 to 2 hours
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This lesson (on pages 46-55 of PDF) features two strategy board games -- one from Ghana and one from China. The first game, Achi, is a cross between checkers and tic-tac-toe.

1 cent - $1 per student Ages 8 - 14 45 to 60 minutes
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Learners make a counting/estimating jar to exchange with friends or bring home.

1 cent - $1 per student Ages 4 - 14 10 to 30 minutes
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In this math lesson, learners are introduced to proportional reasoning through modeling, sharing, and questioning techniques.

$5 - $10 per group Ages 8 - 11 1 to 2 hours
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In this activity about encryption, learners cut out a secret decoder badge from a handout and use it to encode messages to each other.

1 cent - $1 per student Ages 8 - 14 30 to 45 minutes
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Build a house you can fit inside, using cardboard tubes.

1 cent - $1 per group Ages 6 - 14 45 to 60 minutes
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In this activity, learners build scaled-down structures and cantilevers in a series of "building out" challenges with bamboo skewers and tape.

$5 - $10 per group Ages 6 - 14 2 to 4 hours
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In this activity, learners discover that some things only stand up while they are spinning.

$1 - $5 per student Ages 8 - 14 1 to 2 hours
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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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This activity (on page 2 of the PDF under SciGirls Activity: Music and Sound) is a full inquiry investigation into sound frequency.

$5 - $10 per group Ages 8 - 14 1 to 2 hours
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Choose a recipe to double (or triple, quadruple, or halve). Show everyone the recipe and engage them in figuring out: How much will we need to increase the recipe to feed everyone?

1 cent - $1 per group Ages 4 - 14 30 to 45 minutes
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In this activity (page 4), learners work in groups to plan and build large structures using recyclable materials they have brought from home.

$1 - $5 per group Ages 6 - 14 30 to 45 minutes
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This activity is a hit for family events and all ages—some will finish in 45 minutes; others can go on for hours.

1 cent - $1 per group Ages 6 - 14 45 to 60 minutes
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In this activity, learners make critters out of recyclables and apply the rules of mathematics to solve genetics problems.

$5 - $10 per group Ages 14 - 18 45 to 60 minutes
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In this archaeology activity, learners consider ways in which excavating an underwater site is different from excavating a terrestrial site.

$5 - $10 per group Ages 8 - 14 45 to 60 minutes
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In this three/four-day lesson, learners calculate perimeters and areas and draw the castle plan to scale.

$5 - $10 per group Ages 8 - 14 1 to 7 days
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In this math lesson, learners make estimates to analyze the number of apples per acre, and visualize the magnitude of one million.

Over $20 per group Ages 8 - 11 1 to 2 hours
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In this activity, learners make or use pre-made clay beams to scale and proportion. Specifically, they discover that when you scale up proportionally (i.e.

$10 - $20 per group Ages 4 - 14 45 to 60 minutes
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In this math lesson, learners participate in several activities where they apply measurement skills.

$5 - $10 per group Ages 8 - 11 45 to 60 minutes