Curriculum / Math / 3rd Grade / Unit 4: Area / Lesson 3
Math
Unit 4
3rd Grade
Lesson 3 of 14
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Find the area of a rectangle by counting unit squares on grids.
The core standards covered in this lesson
3.MD.C.5 — Recognize area as an attribute of plane figures and understand concepts of area measurement.
3.MD.C.6 — Measure areas by counting unit squares (square cm, square m, square in, square ft, and improvised units).
The foundational standards covered in this lesson
2.G.A.2 — Partition a rectangle into rows and columns of same-size squares and count to find the total number of them.
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
Build a rectangle whose area is 12 square units on top of grid paper. Then trace around the outside of your rectangle. What do you notice about the rectangle you traced on the grid paper? What do you wonder?
a. Sort the cards (cut out from Template: Rectangle Sort) into categories of your choosing. Be prepared to explain your categories.
b. Create a rectangle that would fit in each group.
Adapted from Illustrative Math Grade 3 Unit 2 Lesson 3 Activity 2, accessed on Sept. 21, 2022, 10:27 a.m., is licensed by Illustrative Mathematics under either the CC BY 4.0 or CC BY-NC-SA 4.0. For further information, contact Illustrative Mathematics.
a. Can you and your partner draw the same rectangle without looking at each other's drawing?
b. Place your two rectangles next to each other. Discuss: What is the same? What is different?
c. Switch roles and repeat.
Illustrative Math Grade 3 Unit 2 Lesson 4 Activity 1, accessed on Sept. 23, 2022, 12:38 p.m., is licensed by Illustrative Mathematics under either the CC BY 4.0 or CC BY-NC-SA 4.0. For further information, contact Illustrative Mathematics.
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
Which rectangle has an area of 24 square units?
Myra tiled this figure with unit squares.
What is the area of the figure?
An example response to the Target Task at the level of detail expected of the students.
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.
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Lesson 2
Lesson 4
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 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
Solve word problems involving area.
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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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