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### Course: MAP Recommended Practice>Unit 14

Lesson 16: Relating multiplication and division

# Multiplication word problem: parking lot

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

## Want to join the conversation?

• why does the questin state theat each car has four wheels? Is the relevant to the completion of the question?
• No, it's not relevant to finding the answer to the question: that's the point! Listen to Sal at , where he says that we don't have to care about how many wheels there are. One of the goals of this exercise is to teach the value of finding and using only the relevant information, and ignoring things that aren't relevant.
• If division is same to muiltipulcation is addition and subtraction the same
• 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.
• So you guys are saying that multiplication is the same as repeated addition, and division the same as repeated subtraction?
• 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.
• Why do the word problems include information that is never used?
• In the real world you will often have more information than you need to solve a problem. So word problems often have more information than necessary to help you practice figuring out what information is needed and what can be discarded.
• What if there were bigger numbers involved?
• It would still work, you need to learn another way to multiply- check out the other multiplication videos.
• the wheels on the bus go round and round round and round all though the town