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## 4th grade (2018 edition)

### Course: 4th grade (2018 edition) > Unit 2

Lesson 4: Comparing with multiplication- Comparing with multiplication
- Comparing with multiplication and addition: giraffe
- Comparing with multiplication and addition: money
- Comparing with multiplication: age
- Comparing with multiplication: magic
- Compare with multiplication
- Compare with multiplication word problems

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# Comparing with multiplication

Sal solves multiplication comparison problems. Created by Sal Khan.

## Want to join the conversation?

- 9000 times 9000(3 votes)
- To multiply 9000 x 9000, you multipy 9x9 first then add the 0's.The answer is 81,000,000(3 votes)

- Are there any easier way to do math?(2 votes)
- not really, the thing is math can be done in usually one way, my opinion is to ask for a personalized mission and then maybe it will be able to help you(4 votes)

- How do you go to the next video without losing your energy points for watching the video page?(3 votes)
- You have to wait until the video is complete to get all your points. Then there will be more on the page, or you can select the "next tutorial" and move to the next section.(2 votes)

- Where is the divide sign on the keyboard. Where is the multiply sign on the keyboard?(3 votes)
- if they giving you 36=3* 12 is it something like addition? if not can you explain it please(3 votes)
- this is vary weird! what do i do?!(3 votes)
- what is multiply(1 vote)
- like 4 times 4 is how it sounds....4 4 times. That's multiplication.(3 votes)

- can you tell me what the factor of five is(2 votes)
- there is no factors of five because it is a prime number so the only factors would be 1 and 5(3 votes)

- can you do divisoin,multiply,and adding all together?(3 votes)
- Absoultely! Addition, Subtraction, Multiplication and Division often all appear in many equations related to math, science, business, etc. Use Order of Operations to figure out which operations apply first. In arithmetic, the order of operations is multiply and divide, then add and subtract. It doesn't matter if you multiply or divide first, nor does it matter if you add or subtract first.(2 votes)

- why is it that the star symbol is replacing the times symbol?(2 votes)

## Video transcript

The number 36 is three
times as large as 12. Write this comparison as
a multiplication equation. So they're saying that the
number 36, we'll type 36, is equal to 3 times 12. And I will use this
little star thing. Let's see, if I were
to put an x there, would that have worked as well? No, they would have
viewed that as 3x. So to get this little star
thing, which is normally when you're typing on a computer
how you show multiplication, to get that you have to
press Shift and the number 8. And it also sometimes shows
up on a numeric keypad. But by doing that, I was
able to show multiplication. So this could be read
as 36 is equal to 3 times 12, or 36 is 3
times as large as 12. Let's check our answer. Got it right. Let's do a couple more of these. We can compare the numbers
4 and 20 using addition by saying that 20
is 16 more than 4. Fair enough. That's right. We could also compare 4 and
20 using multiplication. Fill in the blank correctly
to compare the numbers 4 and 20 using multiplication. So they're saying 20 is
blank times as large as four. Well, we know that 4 times 5
is 20, or that 5 times 4 is 20. So 20 is 5 times as large as 4. If I do 4 five times,
I'll get to 20. So let me check my answer. There you go. Let's do one more. The number 6 is three
times as large as 2. Write this comparison as
a multiplication equation. So once again, we could
write that 6 is equal to 2, and then I press
Shift and the number 8 to get that times
symbol, that little asterisk
snowflake-looking thing. 2 times 3. So I could write
it like that, or I could write 2 times
3 is equal to 6. Either of those would be
completely valid things to say. So here I'm saying 6
is-- well, actually, I'd like to say it this way. I'd like to say three
times as large as 2. I think that's a
little bit more fun. So this is exactly 6 is
3 times as large as 2. And we're done.