Navigation

K-5 Grade 3 Unit 2 Lesson 9

Gradeband

•K-5 Math 6-8 Math 9-12 Math

Course

Kindergarten Grade 1 Grade 2 •Grade 3 Grade 4 Grade 5

Unit

Unit 1 •Unit 2 Unit 3 Unit 4 Unit 5 Unit 6 Unit 7 Unit 8

Lesson

Lesson 1 Lesson 2 Lesson 3 Lesson 4 Lesson 5 Lesson 6 Lesson 7 Lesson 8 •Lesson 9 Lesson 10 Lesson 11 Lesson 12 Lesson 13 Lesson 14 Lesson 15

K-5
6-8
9-12

Kindergarten
Grade 1
Grade 2
Grade 3
Grade 4
Grade 5

Unit 1
Unit 2
Unit 3
Unit 4
Unit 5
Unit 6
Unit 7
Unit 8

Lesson 1
Lesson 2
Lesson 3
Lesson 4
Lesson 5
Lesson 6
Lesson 7
Lesson 8
Lesson 9
Lesson 10
Lesson 11
Lesson 12
Lesson 13
Lesson 14
Lesson 15

Lesson | Loading...

Sign in to access protected content and invite other educators

Sign in using your existing Kendall Hunt account. If you don’t have one, create an educator account.

Curriculum

IM K-5 Math
IM 6-8 Math
IM 9-12 Math

Professional Learning

Illustrative Mathematics® has operated as an independent 501(c)3 non-profit organization since 2013.

©2024 Illustrative Mathematics®. Licensed under CC BY-NC 4.0.

The Illustrative Mathematics name and logo are not subject to the Creative Commons license and may not be used without the prior and express written permission of Illustrative Mathematics.

This site includes public domain images or openly licensed images that are copyrighted by their respective owners. Openly licensed images remain under the terms of their respective licenses. See the image attribution section for more information.

Settings

Language

Audience

Not all roles available for this page.

Assessment Access

Sign in to view assessments and invite other educators

Sign in using your existing Kendall Hunt account. If you don’t have one, create an educator account.

English
Español

teacher
student
family

Lesson 9

Warm-up Activity 1 Activity 2

Unit 2, Lesson 9

Measure to Find the Area

Grade 3

Warm-up

What do you notice? What do you wonder?

<p>6 groups of 3 dots. 15 black dots, 3 blue dots.</p>

Rectangular array of dots. 6 groups of 3 dots. 15 black dots, 3 blue dots.

Activity 1

Use a ruler to measure the sides of each rectangle in centimeters. Then calculate the area of each rectangle in square centimeters.

Picture of ruler. Scale, 0 to 8, by 1's. 4 tick marks between each unit.

a rectangle. — A

a rectangle. — B

A rectangle. — C

Activity 2

Your teacher will give you some tape. Use it to create a rectangle with your assigned area.

Area A: 4 square feet
Area B: 6 square feet
Area C: 9 square feet
Area D: 10 square feet
Area E: 12 square feet
Area F: 16 square feet