Curriculum / Math / 3rd Grade / Unit 4: Area / Lesson 7
Math
Unit 4
3rd Grade
Lesson 7 of 14
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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.
The core standards covered in this lesson
3.MD.C.6 — Measure areas by counting unit squares (square cm, square m, square in, square ft, and improvised units).
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Your teacher will give you two kinds of grid paper, one for you and one for a partner. Decide which partner will use which grid paper. Then create a rectangle for each expression on your grid paper.
a. 2 × 5
b. 7 × 3
c. 6 × 8
Grade 3 Unit 2 Lesson 6 Activity 1, accessed on Sept. 16, 2022, 11:45 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. This is a square meter.
What kinds of areas would make sense to measure with square meters? Be ready to explain your reasoning.
b. This is a square foot.
What kinds of areas would make sense to measure with square feet? Be ready to explain your reasoning.
Grade 3 Unit 2 Lesson 7 Activity 1, accessed on Sept. 21, 2022, 6:41 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.
a. For each area tell if you would use square centimeters, square inches, square feet, or square meters to measure it and why you chose that unit.
b. Choose the area that best matches each item. Be ready to explain your reasoning.
Math Grade 3 Unit 2 Lesson 7 Activity 2, accessed on Sept. 21, 2022, 6:47 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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Choose the best estimate for the area of a postcard.
What unit would you use to measure the area of a playground? Explain.
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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 6
Lesson 8
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
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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