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Topological Puzzles
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In this activity, learners construct three math puzzles out of simple materials like wood, string, and Styrofoam.

Two Washers
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In this activity, learners create a mind and math puzzle that requires a three-dimensional solution.

Number Sense and Computation: To Half or Half Not
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In this math lesson, learners use slices of bread and geoboards to explore several ways to divide a rectangle in half. Learners also identify equivalent fractions that represent one-half.

Blazing the Trail
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In this math lesson, learners estimate distances between landmarks and use a map and scales to determine the actual distances.

Geometry and Spatial Relations: Mirror, Mirror
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In this math lesson, learners use hinged mirrors to discover that regular polygons are composed of triangles tessellating around a center point.

Ball Bounce Experiment
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In this activity, learners investigate the properties of different types of balls.

Looking Through the Algebraic Lens
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In this two-part math lesson, learners investigate problems that foster algebraic thinking across content strands. In the first part, learners explore even and odd numbers linked to quilts.

Statistics: Steppin' Out
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In this math lesson, learners construct box-and-whisker plots to analyze and compare data sets. Learners investigate whether or not long-legged people run faster than short-legged people.

Exponential Models: Rhinos and M&M’s ®
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In this math lesson, learners model exponential decay and exponential growth using M&M's, paper folding, and African rhino population data.

Statistics: Button, Button
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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.

Otter Smorgasbord
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In this graphing activity (on pages 33-40), learners investigate how much and what kinds of food sea otter pups eat during their first year of life.

Patterns and Relationships: Peddling Petals
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In this math lesson, learners use the setting of a flower-making fundraiser to explore a variety of patterns. Learners examine the patterns in a flower design made of triangles surrounding a square.

Proportionality: The X-Plane Generation
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In this activity, learners build a 1:140 "scale model" of NASA's X-33 Reusable Launch Vehicle (RLV) Technology Demonstrator, and investigate how the model dimensions compare to the real vehicle.

Mix It Up
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In this math lesson, learners are introduced to proportional reasoning through modeling, sharing, and questioning techniques.

Breathing Yeasties
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In this life science activity (page 8 of the PDF), learners explore the carbon cycle by mixing yeast, sugar and water.

Medical Mystery
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This activity (on pages 15-23) combines interactive role-playing and graphing to introduce learners to the health affects of pollen.

Geometry and Spatial Relations: Tessellations WOW!
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In this math lesson, learners explore tessellations through literature, music, writing, and art activities.

Measurement: Sand Babies
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In this math lesson, learners explore and investigate measurement using standard and non-standard units.

Geometry and Spatial Relations: Sidewalk Capers
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In this math lesson, learners use a variety of manipulatives to explore spatial relationships of squares and their transformations.

Number Sense and Computation: An Apple a Day
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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.