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Adding Two Rectangles to Find the Total Area

Adding Two Rectangles to Find the Total Area

Author: Crystal Lang
Description:

By the end of this lesson, students will be able to use the formula for area to calculate the area of a rectangle, and add the area of rectangles to find the total area of a figure.

Using the Third Grade Common Core State Standards, 3.MD7 Relate area to the operations of multiplication and addition.  They will learn to decompose 2 non-overlapping rectangles and add the sum of those to areas to find the total area of that polygon.

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Tutorial

Adding Areas to Find the Total Area

Watch this video to understand how to decompose a figure and then add the figure back together to find the total area.

Practicing the Formula for Area

This video takes a closer look at how to use the formula for area to calculate the total area of a rectangular figure. It gives the students the opportunity to try some practice problems on their own, and then verify their result with the video.