3rd Grade Math 11.6, Use Area Models

See the description for links to videos 11.4 and 11.5. We have learned that we can count the unit squares to find the area of a rectangle. We can also multiply to find the area of a rectangle. A rectangle that is covered by unit squares is like an array. It has rows of unit squares with an equal number of unit squares in each row. We can also use repeated addition to find the area of a rectangle. When a figure is broken into unit squares, we can find its area using three methods: we can count the squares, use repeated addition, or multiply the number of rows by how many are in each row. When the figure is not broken into unit squares, we can measure two sides with a ruler and use multiplication. If we know more than one way to find a figures area, we can use one method to find the area and another method to check our answer. We show an example of two rectangles that have the same area, though they have a different numbers of rows. Just like we learned with arrays, we can use the Commutative Property of Multiplication which states that we can multiply in any order. We show an example of finding how much more area is green than pink in a figure. We select each equation that can be used to find the area of a given rectangle. We look ahead towards 4th grade math and higher when we will learn how to find the area of a figure by using multiplication and subtraction, or multiplication and addition.

3rd Grade Math 11.4, Understand Area
https://youtu.be/aFV10b08kz4

3rd Grade Math 11.5, Measure Area
https://youtu.be/zuHw8YEfiUg

3rd Grade Math Playlist (2015)
https://www.youtube.com/playlist?list=PLKi4WTp6PRGVPton7wjphpYAhdTjnJsw0

I'm using the Houghton Mifflin Go Math!
2015 copyright textbook for this playlist.

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