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

You have saved this lesson plan!

Here's where you can access your saved items.

Content placeholder

or to view additional materials

You'll gain access to interventions, extensions, task implementation guides, and more for this lesson plan.

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