# Composing and Decomposing Polygons using Tetrominoes

Videos and solutions to help Grade 3 students learn how to reason about composing and decomposing polygons using tetrominoes.

Common Core Standards: 3.G.1

Related Topics:
Lesson Plans and Worksheets for Grade 3
Lesson Plans and Worksheets for all Grades

New York State Common Core Math Grade 3, Module 7, Lesson 7

Lesson 7 Concept Development

Problem 1: Use tetrominoes to compose polygons.

Problem 2: Use tetrominoes to compose polygons with given areas. Lesson 7 Homework

1. Color tetrominoes on the grid to create three different rectangles. You may use the same tetromino more than once.

2. Color tetrominoes on the grid below:
a. To create a square with an area of 16 square units.
b. Create at least two different rectangles each with an area of 24 square units. You may use the same tetromino more than once.

3. Explain how you know the rectangles you created in Problem 2(b) have the correct area.

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