Unit 2, Lesson 9
Measure to Find the Area
Grade 3
Preparation
Lesson Purpose
The purpose of this lesson is for students to measure side lengths of rectangles to find their areas.
Lesson Narrative
In grade 2, students measured length in centimeters and feet. In earlier lessons, students found the areas of rectangles in standard units. Here, students measure side lengths of rectangles and multiply them to find the areas. They also find side lengths that result in a rectangle with a given area.
Provide rulers for students to use during the Cool-down.
- Engagement
- MLR8
- Explain (orally) how to use a ruler to find the area of a rectangle.
- Let’s measure the sides of rectangles and find the areas.
Required Materials
Activity 1
Required Preparation
Activity 2
- Each group of 4 students needs 1 roll of either painter's tape or masking tape.
Teacher Reflection Questions
Identify ways the math community you are fostering is going well. What aspects would you like to work on? What actions can you take to improve those areas?
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