yego.me
💡 Stop wasting time. Read Youtube instead of watch. Download Chrome Extension

Decomposing shapes to find area (grids) | Math | 3rd grade | Khan Academy


2m read
·Nov 11, 2024

Each small square in the diagram has a side length of one centimeter. So, what is the area of the figure? We have this figure down here in blue, and we want to know its area. Area is the total space it covers, and we're also told that each of these little squares has a side length of one centimeter.

That means each of these squares is one square centimeter. We can find the area by seeing how many square centimeters this figure covers. One way would be just to try to draw the little square centimeters and count them. There’s one square centimeter, there’s two, and so on, and keep counting them all the way through.

Or, what we could do is look at this and try to break it into two shapes. We can say down here into two rectangles. Down here, we have one rectangle, and up here, we have a second rectangle. Then we can find the area of each rectangle and add it together to find the total area that the figure covers.

Down here on the bottom, we have two rows of unit squares, and each of those has one, two, three, four, five, six, seven. So, one, two, three, four, five, six, seven. So, there are two rows of seven unit squares or seven square centimeters. The bottom rectangle is made up of 14 square centimeters. It covers 14 square centimeters.

Now, for the top rectangle, let’s see: we have one row, two, three, four, five rows, and each of those rows has one, two square centimeters. So, we have five rows of two square centimeters or 10. This top rectangle here that we have in blue covers 10 square centimeters.

Plus, the bottom rectangle that we outlined in green covers 14 square centimeters. So, in total, the entire figure covers 24 square centimeters. Thus, 24 square centimeters is our area, because area is how much space it covers, and we figured out that it covered 24 square centimeters.

More Articles

View All
The aftermath... Tenants Stopped Paying Rent
What’s big, eyes? It’s Graham here. So last month, I addressed a highly publicized article which found that nearly 1⁄3 of Americans were unable to pay their rent for the month of April. At the time, that was a very alarming statistic. For someone who has…
Small Talk Tip - How To Introduce Yourself To Someone New!
Emma: This is my best small talk tip, how to introduce yourself to someone new. Right now I’m going to teach you my four-step method to make introducing yourself to someone in English easy and enjoyable. You can use these steps to introduce yourself at wo…
Partitioning rectangles
So, I have a rectangle drawn right over here, and my goal is to split this rectangle up into smaller equal squares. The way that I’m going to do that is by first dividing this rectangle into two rows—two equal rows—and then I’m going to divide this rectan…
Warren Buffett: How You Need to Be Investing in 2024
If you want the ability to build generational wealth and the financial freedom to retire early and leave the unending corporate rat race, you should be listening to Warren Buffett’s most recent investing advice. For the better part of the last year, lege…
Warren Buffett: The Big Problem with Dividend Investing
Why won’t you pay a dividend to your shareholders? Well, we think our shareholders 5 years from now will be wealthier counting what they would get from the reinvestment of the dividend. We think they’ll be wealthier if we hold on to the money now. We may…
Office Hours with Kevin Hale and Qasar Younis at Startup School SV 2016
Dramatic entrance that was easy, easily pleased crowd. Uh, H we have a favor to ask of all of you guys out there. Um, how many people follow Justin on Snapchat? All right, great. So Justin’s not here. Oh, but there should be punishment for that. But there…