Curriculum / Math / 3rd Grade / Unit 4: Area / Lesson 9
Math
Unit 4
3rd Grade
Lesson 9 of 14
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Solve word problems involving area.
The core standards covered in this lesson
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.
The essential concepts students need to demonstrate or understand to achieve the lesson objective
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Tasks designed to teach criteria for success of the lesson, and guidance to help draw out student understanding
Act 1:
a. What do you notice? What do you wonder?
b. Does Maria have enough pink paint to cover one of her bedroom walls?
Act 2: Use the following information to determine whether Maria has enough paint to cover one of her bedroom walls -
Act 3: Reveal the answer -
Maria does have enough paint to cover one of her bedroom walls with one coat of paint, but not two coats. Was your answer reasonable? Why or why not?
Act 4 (sequel):
a. Amir is getting hardwood floors in his bedroom, which measures 8 feet by 9 feet. How many square feet of hardwood flooring will Amir need?
b. The area of Theo’s banner is 28 square meters. If the width of his banner measures 4 meters, how long is his banner?
Grade 3 Mathematics > Module 4 > Topic D > Lesson 12 of the New York State Common Core Mathematics Curriculum from EngageNY and Great Minds. © 2015 Great Minds. Licensed by EngageNY of the New York State Education Department under the CC BY-NC-SA 3.0 US license. Accessed Dec. 2, 2016, 5:15 p.m..
Problem Set
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A task that represents the peak thinking of the lesson - mastery will indicate whether or not objective was achieved
Blake wants to cover a page of his scrapbook with colored paper. The page measures 6 inches by 8 inches. How much colored paper does Blake need to cover the entire scrapbook page?
A room is 63 square feet. Its length is 9 feet. What is its width?
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Extra Practice Problems
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Lesson 8
Lesson 10
Topic A: Understanding Concepts of Area
Understand that area is an attribute of plane figures that is a measure of how much flat space an object takes up. Find the area of a figure using pattern blocks, which can be used as concrete non-standard units.
3.MD.C.5 3.MD.C.6
Understand that area is measured using square units. Find the area of a figure using square tiles.
Find the area of a rectangle by counting unit squares on grids.
Find the area of a rectangle with incomplete information about its rows and columns of square units.
3.MD.C.6 3.MD.C.7.A
Find the area of a rectangle that has been superimposed over a grid.
Find the area of a rectangle through multiplication of the side lengths.
3.MD.C.7.A 3.MD.C.7.B
Understand standard units for measuring area, including square inches, square centimeters, square feet, and square meters, and choose an appropriate unit to measure the area of various rectangles.
3.MD.C.6
Measure the side lengths of a rectangle to find its area.
3.MD.C.7.B
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Topic B: The Distributive Property and Composite Area
Compose and decompose a rectangle, seeing and making use of the idea that the sum of the areas of the decomposed rectangle is equal to the area of the composed rectangle.
3.MD.C.7.C
Apply the distributive property as a strategy to find the total area of a large rectangle.
Recognize area as additive. Find the area of a composite figure as shown on a grid or with all side lengths labeled.
3.MD.C.7.D
Recognize area as additive. Find the area of a composite figure when not all dimensions are given.
Recognize area as additive. Find the area of a complex composite figure.
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