Area

Lesson 8

Math

Unit 4

3rd Grade

Lesson 8 of 14

Objective


Measure the side lengths of a rectangle to find its area.

Common Core Standards


Core Standards

  • 3.MD.C.7.B — Multiply side lengths to find areas of rectangles with whole-number side lengths in the context of solving real world and mathematical problems, and represent whole-number products as rectangular areas in mathematical reasoning.

Criteria for Success


  1. Measure the side lengths of a rectangle and multiply them to find the area.
  2. Draw a rectangle with a specified area and identify its dimensions, or draw a rectangle with specified side lengths and identify its area. 

Tips for Teachers


Lesson Materials

  • Ruler (1 per student) — These need to have both inch and centimeter measures. Also these are needed for the Problem Set and Homework.
  • Meter stick (1 per class) — These might come in handy for a challenge problem on the Problem Set.
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Anchor Tasks


Problem 1

Use a ruler to measure the rectangles in centimeters. Then, calculate their area.

a.   

b.   

c.   

d.   

Guiding Questions

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Problem 2

a.   Use your ruler to create a rectangle whose area is 12 square inches. Draw an outline of the shape below.

b.   How many unique rectangles can you make whose area is 12 square inches? How do you know you’ve found all the possible rectangles whose area is 12 square inches?

Guiding Questions

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Problem Set


Answer Keys

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Discussion of Problem Set

  • How can you use square inch tiles to check your work in #1? What relationship is there between the side lengths and the number of rows and columns of inch tiles?
  • How many different rectangles could you make in #2? How do you know there are not other rectangles you could make? 
  • How many different rectangles could you make in #4? How do you know there are not other rectangles you could make? Why are there more unique rectangles with an area of 18 square units than 8 square units?

Target Task


Use your ruler to find the area of the rectangle in square inches.

Student Response

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Additional Practice


The Extra Practice Problems can be used as additional practice for homework, during an intervention block, etc. Daily Word Problems and Fluency Activities are aligned to the content of the unit but not necessarily to the lesson objective, therefore feel free to use them anytime during your school day.

Extra Practice Problems

Answer Keys

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Word Problems and Fluency Activities

Word Problems and Fluency Activities

Help students strengthen their application and fluency skills with daily word problem practice and content-aligned fluency activities.

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Lesson 7

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Lesson 9

Lesson Map

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Topic A: Understanding Concepts of Area

Topic B: The Distributive Property and Composite Area

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