Lesson plan

Use understanding of area to solve division problems using a missing side length

teaches Common Core State Standards CCSS.Math.Content.4.MD.A.3 http://corestandards.org/Math/Content/4/MD/A/3

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Big Ideas: Area measures the space inside of a two dimensional figure. The formula for area can be used to find missing side lengths. Students build off of their work in third grade (3.MD.5) of area and perimeter and begin to think more abstractly. Based on work in previous grades with multiplication, spatially structuring arrays, and area, they abstract the formula for the area of a rectangle A = l x w. It is important for students to be able to mentally visualize the problem to assist with the problem solving concepts. Students' repeated use of area and perimeter formulas allows students to then apply the formulas to real world situations.This lesson allows for the visualization application of these formulas. Vocabulary: perimeter, area, length, width, rectangle, formula Special Materials: graph paper, optional