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

Area with partial grids | Area | 3rd grade | Khan Academy


2m read
·Nov 10, 2024

We're told the following rectangle is partially split into unit squares. What is the area of the rectangle above? So, pause this video and see if you can figure that out.

All right, now let's do this together. So first, it's good to just know what do they mean when they say area. Well, they say it's partially split into unit squares. When they're talking about a unit square, they're talking about a square like this. And when we're talking about area, we're talking about how many of these unit squares would exactly cover this entire shape. That many unit squares would be the area of this entire rectangle.

So how could we do that? Well, what we could do is we could keep drawing these lines that have already been partially drawn. We can then see how many of these unit squares we have. So let's just finish drawing these lines here. I'll try to draw it as neatly as I can.

So we have that, we have that like there, and then let me complete this one and let me complete that one. I'm almost done that one and then that one. And so what we have here, let's see how many rows do we have? We have one, two, three, four, five rows.

And in each of those rows, let me do it this way, five rows, and in each of those rows, how many squares do we have? Let's see, we have one, two, three, four. So you could view it as we have five rows of four.

So how many total of these unit squares exactly cover this rectangle? Well, we could just count them. We could see that that is going to be, well, it's going to be five rows of four. So it's going to be one row that's four, then another four, then another four, then another four, and then another four.

And let's see, yep, I have five fours here I'm adding, the five rows of four each there. And what is that going to be equal to? Well, this is going to be equal to four plus four is eight, plus four is twelve, plus four is sixteen, plus four is twenty.

So the area of the rectangle above is going to be 20. And it's important to say 20 of what? It's 20 square units. Or maybe I could say unit squares, either way. But I'll call it square units, and we are done.

More Articles

View All
How I Escaped Corporate Hell (They Don't Want You To Know This)
Speaker: To raising your vibration, this is the video version of my podcast. If you want the audio version you can click the link in the YouTube description. Apologies guys, if you’re listening on the audio that was a YouTube intro and vice versa. If you …
NASA Trailblazer: Katherine Johnson | National Geographic
I liked what I was doing. I liked working, but little did I think it would go this far. Katherine Johnson. Catherine G. Johnson. Catherine Johnson. [Applause] Liftoff! The clock has started. Mathematics is the basis of the whole thing. [Music] You graduat…
Compelling Models for Conservation | Explorers Fest
Loved it! I don’t— I didn’t really think about where it came from. Probably in the same way that you didn’t really think about where your food came from when you were a kid too. I don’t remember exactly when I decided to stop eating sharks in soup or when…
Creativity break: how does creativity play a role in your everyday life? | Khan Academy
[Music] As we move forward as scientists, as biologists, the old adage is true: a picture is worth a thousand words. So, what is that image, that graph, that graphic, or even that imagery, um, that really gets to the core of your idea? Um, it almost gets…
Ray Dalio on his Principles for Success
Can you think about, like, what are some of your first principles? Life is a journey. It’s an adventure, an adventurous journey in which you come into it with having a certain nature. That nature, um, you’re in a journey to find the path to match up with …
SUPER RARE $34,000 Mont Blanc Will DOUBLE in Value | Kevin O'Leary |
[Music] From Germany, just send them straight out the door. Okay, thanks a lot, let’s go upstairs. Welcome to Miami. [Music] So, just coming from—well, we have the head of—we have the head of VP of retail, and I think one of the marketing people are brin…