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CCSS.MATH.CONTENT.4.MD.3

Solve problems involving measurement and conversion of measurements from a larger unit to a smaller unit.

Description

Apply the area and perimeter formulas for rectangles in real world and mathematical problems. For example, find the width of a rectangular room given the area of the flooring and the length, by viewing the area formula as a multiplication equation with an unknown factor.

This unit is basically chapter 5 in our Math Expressions curriculum.  If your district uses Math Expressions, then this unit will make a lot of sense to you.  If you don't have Math Expressions, this unit can still help guide you through teaching your kids meausurement using customary and metric systems.

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This lesson is designed to introduce fourth grade students to formulas to find the perimeter and area of an object.  Students will make the transition from adding side lengths to find the perimeter of a rectangle to using the formula P = (2 * l) + (2 * w) and why A = b * h should be used instead of A = l * w to find the area of polygons.  Students will apply these formulas to fin

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