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Lesson 4: Multiply to find area

# Comparing areas of plots of land

Sal finds area of two rectangles to solve a word problem. Created by Sal Khan.

## Want to join the conversation?

• This video totally confused me. I mean I thought from the scale he drew that Fibbonachi Drive was correct?
• To look at the drawings is to estimate the size of something. You need to calculate the exact area using the numbers provided to work out which one is bigger.

I hope this helps.
• Is there a trick for telling when you are doing area or perimeter? If so, what is this trick? I would really like to know. I'm guessing there are multiple.
• That's a hard question to answer...but take in mind that perimeter is the outside of a 2-D shape will area is the land or whatever that it covers. For example a square fence with the dimensions of 12 ft by 12 ft. You can multiply and find out how many ft^2 can fit inside the fence or you can see how much you need to make the outside edges or fences.
(1 vote)
• what are the square meters?
• Square meters are meters raised to the power of 2 (m^2). When calculating areas, your unit will always end up squared because you are multiplying a side by a side, or unit by unit. Think of it this way, if you are multiplying 2 x 2 you can simplify that to 2^2 or 2 squared; same goes for meters and other units.
• looking for fun welcome to the cup head show!
• how many measurements are there?
• There are many measurements. However, they are not really important unless you have different measurements. Then you have to do more math to find area.
• Hi, umm. Which side is the length and which side is the width?
I've noticed in the exams the "length" and "width" switch sides frequently yet my answers always seem to be wrong. Is there a set law as to what side is the length and which one is the width?
(1 vote)
• It doesn't really matter unless the question asks you to determine the length and the width. The width is determined wide it is the length is determined how long it is. Normally, the length is longer than the width.
(1 vote)
• Is the number for the plot on apple lane the first 6 numbers for pi? Also, is the one on Fibonacci Drive really digits in Fibonacci?
(1 vote)
• hehe, yep that's true. Well noticed!
(1 vote)
• why do most peolpe love mickey mouse?