Lesson plan

15. Finding area, perimeter, and missing sides (A)

teaches Common Core State Standards CCSS.Math.Content.4.MD.A.3 http://corestandards.org/Math/Content/4/MD/A/3
teaches Common Core State Standards CCSS.Math.Content.4.NBT.B.5 http://corestandards.org/Math/Content/4/NBT/B/5
teaches Common Core State Standards CCSS.Math.Content.4.NBT.B.6 http://corestandards.org/Math/Content/4/NBT/B/6
teaches Common Core State Standards CCSS.Math.Content.4.OA.A.3 http://corestandards.org/Math/Content/4/OA/A/3
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards CCSS.Math.Practice.MP8 http://corestandards.org/Math/Practice/MP8

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Lesson objective: Apply formulas to find area, perimeter, and the measure of a missing side.

This lesson provides an opportunity for students to apply their knowledge and understanding of area and perimeter to a real-life situation. Students are asked to help figure out the dimensions of a new petting zoo.

Key Concept students will use:

• We can use the relationship between multiplication and division to solve mathematical and real-world problems.

Skills students will use:

• Find the area of a rectangle (with whole number length sides) by tiling it with unit squares or by multiplying the side lengths. (Grade 3, Unit 2,  3.MD.C.7.a)

• Use division to solve for the missing side when given the area and length or width of a rectangle.

Students engage in Mathematical Practice 1 (Make sense of problems and persevere in solving them) as they make connections to prior knowledge to find an entry point.

Students engage in Mathematical Practice 8 (Look for and express regularity in repeated reasoning) as they connect principles of operations to efficiently solve a multistep problem.

Key vocabulary:

• area
• perimeter

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• 15. Finding area, perimeter, and missing sides (A)