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## 4th grade

### Course: 4th grade > Unit 3

Lesson 1: Comparing with multiplication- Multiply by 1-digit numbers: FAQ
- Comparing with multiplication
- Comparing with multiplication and addition: giraffe
- Comparing with multiplication and addition: money
- Comparing with multiplication: magic
- Compare with multiplication
- Compare with multiplication word problems

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# Comparing with multiplication: magic

CCSS.Math:

Sal solves a multiplication comparison word problem with Harry Potter characters. Created by Sal Khan.

## Want to join the conversation?

- At2:00. What a difficult lenguaje. I'm from Catalonia and I'm losed. Can enybody explain what is he expleining?(11 votes)
- Ferran, el senor pregunta que si Hermione puede levantar un plumaje de aves Treinta y Cinco pies en el aire, y lo levanta Cinco veces mas alto de lo que Ron lo levanta, cuanto mas lo levanta? Bueno la respuesta seria 7, porque cinco multiplcado por siete es treinta y cinco. Buena suerte Ferran con sus estudios.(6 votes)

- what is the fastest way to get energy points(10 votes)
- can't we say 5 times 7 = 35(7 votes)
- Yes, you can do it that way or you could do 7 times 5 = 35.(5 votes)

- oh my gosh this can be explaned so simply but they make it sound complocated.and WHAT MaGiC??(6 votes)
- can someone explain why they did it in a harder and longer way then just doing it quick and easy you could have just done 7x5 and you would get 35 and you know it would be 7(7 votes)
- To help you later on.(1 vote)

- why did you say the same word twice(4 votes)
- so you can remeber(3 votes)

- Did anyone else notice that he said Hermione wrong the first time? I did!(5 votes)
- When we learn a harder division how can this even help?!(4 votes)
- You will still need to do normal dovision(2 votes)

- can you multiply negative numbers with word problems(4 votes)
- Why I can’t hear the video?(4 votes)

## Video transcript

Ron and Hermione are
practicing lifting feathers into the air with magic. Hermione can lift a feather
35 feet into the air, which is 5 times as high as
Ron can lift a feather. How high can Ron lift a
feather with his magic? So Hermione, this 35 feet
is 5 times more than Ron. So to figure out
what Ron can do, we just take what Hermione
can do and divide by 5. So what's 35 divided by 5? Well, 5 times 7 is 35. So 35 divided by 5 is 7. So Ron can lift a feather
7 feet in the air. So let's check our answer. Now, if you have trouble
with this-- and we could also look at
the hints for this. So they show that Hermione can
lift a feather 35 feet, which is 5 times higher than Ron. So this could be the length
of how high Ron can raise it. And so, if you were
to actually divide 35 into 5 equal sections,
so 5 times question mark is 35, that's the same thing
as saying 35 divided by 5 is question mark. And 35 divided by 5 is indeed 7.