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## 3rd grade

### Course: 3rd grade > Unit 4

Lesson 3: Relating multiplication and division- Relating division to multiplication
- Relate division to multiplication
- Relate multiplication and division equations
- Fact families
- Multiplication word problem: parking lot
- Division word problem: school building
- Relate division to multiplication word problems

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# Multiplication word problem: parking lot

CCSS.Math:

Sal uses a picture and repeated addition to solve a multiplication word problem. Created by Sal Khan.

## Want to join the conversation?

- that video math problem was so easy :)(2 votes)
- I'm glad you are doing well, but it isn't always easy for everyone. Please be careful not to hurt anybody with that. If you want to help others learn you can answer these questions:

https://www.khanacademy.org/math/arithmetic-home/d(12 votes)

- how many wheels can fit in a parking lot(5 votes)
- It greatly depends on the area of the parking lot from its sides, the volume if wheels are allowed to be placed on top of one another, and the radius of each wheel.(4 votes)

- hey the vid did not make sence(6 votes)
- Did you draw all those cars(6 votes)
- Can I have 10 votes for this, please?(6 votes)
- So you guys are saying that multiplication is the same as repeated addition, and division the same as repeated subtraction?(4 votes)
- It's tempting to say that division is repeated subtraction. If you view division this way, then you'll have to count how many times you've subtracted.(3 votes)

- When I was finking I already know it was 42(4 votes)
- have you ever been smart?🤓(2 votes)
- No, addition is the opposite of subtraction and multiplying is the opposite of divison because: 8 × 8 = 64 and 64 ÷ 8 = 8 and 8 + 8 = 16 and 16 - 8 = 8 are true if they were not true then no math would work correctly.(2 votes)
- How does life work?(2 votes)

## Video transcript

The local grocery store opens at nine. Its parking lot has six rows. Each row can fit seven cars. Each car has four wheels. How many cars can the parking lot fit? And I encourage you to pause the video
and think about this yourself. Try to figure it out on your own. So, let's re-read this. The local grocery store opens up at nine. Well, that doesn't really matter. If we're thinking about
how many cars can the parking lot fit. So we don't really have to care about that. We also dont have to care about
how many wheels each car has. They're not asking us how many
wheels can fit in the parking lot. So we can ignore that. What we really care about is
how many rows we have. And how many cars can fit in each row. What we have is -- We have six rows
and each row can fit seven cars. We're going to six groups of seven. Or, another way of thinking about it. We're going to have six times seven
cars can fit in the parking lot. What is this going to be equal to? This is literally six sevens added up. This is the same thing as
one, two, three, four, five, six. That last seven looks strange. Now we're going to add these up. Seven plus seven is fourteen. Twenty-one, twenty-eight,
thirty-five, forty-two. Six times seven is equal to forty-two. So forty-two cars can fit in the parking lot.
Don't believe me? I made a little diagram here. We have six rows. This is the first row. Second.. Third.. Fourth.. Fifth.. Sixth. Each row can fit seven cars.
You see it here. One; Let me make that a little brighter. One.. Two.. Three.. Four, five, six, seven. How many cars are there? You have seven. Fourteen.. Twenty-one.. Twenty-eight.. Thirty-five.. Forty-two total cars. Six rows of seven.