National Security Agency
Classifying Triangles
Building on young mathematicians' prior knowledge of three-sided shapes, this lesson series explores the defining characteristics of different types of triangles. Starting with a shared reading of the children's book The Greedy...
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The Greedy Triangle
Third graders use the book "The Greedy Triangle" to practice measuring perimeter and area. They also calculate the length of objects.
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Triangles
Third graders recognize geometric shapes with acute angles, make geometric shapes with acute angles on geoboards, and draw acute angles on geopaper.
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3-D Attributes
Students explore geometric solids. In this geometry lesson, students listen to the book The Greedy Triangle by Marilyn Burns, then work in groups to sort geometric solids into various categories. Students define geometric solids...
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Math: Geometric Fun and Games
Third graders discover geometric shapes by completing a series of games and activities. Using ropes with knots tied every foot, they make shapes such as squares, triangles, and hexagons. In pairs, 3rd graders use pattern blocks to...
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Obtuse Angles
Third graders recognize and identify geometric shapes, work with manipulatives to reinforce understanding, and create polygons with various angles to display their knowledge of the different types of angles.
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What Shape am I?
Students analyze characteristics of geometric shapes. They find shapes in their environment, and communicate why it is like the shape of their choice and not like another shape.
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Covering Spaces
Third graders become more familiar with various geometric shapes by completing the games and activities in this lesson. They keep track of the number of each shape they use in each of the three ways.
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Puzzled?
First graders practice identifying simple geometric shapes. As a class, they discuss positional words and review the words for simple shapes and their characteristics. They work together to create their own puzzle using the shapes.