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Algebra

Polygons, Perimeter, and Patterns: Discovering the Algebra in Perimeter Patterns

3-5
In this lesson, students use pattern blocks to create polygon "chains" and calculate the perimeter of the trains as they get longer. The students will recognize and create patterns based on adding the same shape repeatedly to the train. The students then write algebraic expressions to describe the patterns.
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Geometry

Trying Out Tangrams: Applying Knowledge of Geometry Vocabulary

3-5
In this lesson, students develop their understanding of the terms quadrilateral, parallel, and right angle. They apply that understanding in problem-solving activities with tangrams.
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Measurement

Elapsed Time: Using a Timeline to Determine Elapsed Time

3-5
Students learn to calculate elapsed time by using a timeline, and then complete three engaging and fun activities that plan a circus performance, their class schedule, and their day.
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Geometry

Getting to Know the Solids

3-5
Students are introduced to some of the basic polyhedra. Students explore the shapes of the faces of these solids.
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Geometry

Inversions

3-5, 6-8

 Using inversions — words that can be read in more than one way — as the context, students will be introduced to various types of symmetry. After exploring the symmetries that exist with letters of the alphabet, they will make inversions of their own name.

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Algebra

Making Change

Pre-K-2

To begin this lesson, children model prices mentioned in a children’s book. Then they make change from a given amount by counting on from the price.

Note: Counting on to make change is a very challenging activity. In initial instruction, it is best to restrict the coins used in making change to pennies and dimes.

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Data Analysis and Probability

Making Glyphs

Pre-K-2
In this lesson, students learn a powerful way to display data—using a glyph. They collect data and create pictures using the data. Students also interpret glyphs made by other students.
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Geometry

Making Rectangles

Pre-K-2
In this activity, students use their knowledge of number, measurement and geometry to plan the steps necessary for a ladybug to draw rectangles of different sizes. As they experiment, students begin to understand the relationship between the shape of a rectangle and the lengths of its sides. They also develop a sense of the amount of turn in a right angle.
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Geometry

Making Triangles

Pre-K-2
In this activity, students use 45- and 90-degree angles to create triangles, and develop an understanding of the relationship between angles and the shape of triangle. Students use their knowledge of number, measurement and geometry to design a "virtual path" using two different angles to help a ladybug reach its hiding place under a leaf.
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Geometry

Making Virtual Triangles

Pre-K-2
In this lesson, students use virtual manipulatives to explore triangles. They create virtual representations of triangles on an electronic geoboard. They also identify shapes within shapes using tangrams. This activity is appropriate for a computer lab, so all students have access to the virtual manipulatives.