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## Arithmetic (all content)

### Unit 1: Lesson 8

How 10 relates to place value- Multiplying whole numbers by 10
- Multiply whole numbers by 10
- Dividing whole numbers by 10
- Divide whole numbers by 10
- Multiply and divide by 10
- Understanding place value
- Comparing place values
- Place value when multiplying and dividing by 10
- Place value when multiplying and dividing by 10

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# Comparing place values

Sal compares numbers in different place values. Created by Sal Khan.

## Want to join the conversation?

- how does this help me in pre algebra(8 votes)
- Place values are important for understanding numbers in general. It matters less afterwards in algebra because the focus on numbers changes to a focus on functions, but while you're in pre algebra you're still looking at how numbers work with each other and how to do different operations.(2 votes)

- Compare the values of the underlined digits

6,300 (3)is underlined and 530 (3)is also underlined

Then the question is

The value of the 3 in*____*is*____*times the value of 3 in*____*(4 votes)- This is asking you to compare the place values.

The 3 in 6300 is in the hundreds place.

The 3 in 530 is in the tens place.

How does 300 compare to 30? That is what it is looking for. Try to figure it out. Comment back if you get stuck, but tell me what you tried to do or why you are stuck. And, I'll help.(5 votes)

- how high up can you go for the place value os a number?(4 votes)
- so if i add 100 zeros to 9 what number will i get(1 vote)
- is there a simpler method to do this(1 vote)
- Hi sal I'm 7 th greade and I'm doing this because my goal it to master a topic and I am having hard times doing that(1 vote)
- Explain the relationship between place values, and how the place values change as you go to the left and to the right. Use the numbers 10, 1, and 0.1 in your explanation.? what will it be(1 vote)
- What is the value of digit 9 of 913,256.?(1 vote)
- Write the value of the digit 913,256.(1 vote)
- Its so easy its 9,00,000+10,000+3,000+200+50+6

Alexzander Malalaying America(1 vote)

- how do you do algebra? and hi guys(1 vote)
- First finish this section, then move on to algebra!(1 vote)

## Video transcript

We have the number 43,249. Now, what I want you to think
about is what these two 4's actually represent and how
much more value is represented by this first 4, this 4 on the
left, than this 4 on the right. And I encourage you
to pause this video and think about that. So let's just think about what
each of these digits represent. So the 9 is in the ones place. So it literally
represents 9 ones. This 4 on the right, I should
say, is in the tens place so it literally represents 4
tens, or 4 times 10, or 40. This 2 is in the hundreds
place, so it literally represents 2 hundreds, or 200. This 3 is in the
thousands place, so it represents 3 thousands. And then the 4 on the left is
in the ten thousands place. So it literally
represents 4 times 10,000, or 4 ten thousands, or 40,000. So let's actually
compare the value that we're getting
here versus here. So what's the difference
between 40,000 and 40? Well, 40,000 has four zeroes
while 40 only has one. So if you wanted to
go from 40 to 40,000, you would have to add
three more zeroes. And we already know
how to do that. You could add three more
zeroes by multiplying by 1,000. So 40,000 is equal
to 1,000 times 40. Or we could say the
4 on the left here, this blue circled 4 represents
1,000 times the value as the yellow circled 4. Now, another way of
thinking about it is every time you move
place values to the left, as you see here-- this is
tens, hundreds, thousands, ten thousands-- you're
increasing what those place values represent
by a factor of 10. So if you're going from
this 4 to this 4, times 10 times 10 times 10, you
multiply by 10 the place value. And you see that with the
place values right over here, the place values increase
by a factor of 10 each time. So if you're going from
this place to this place, and you have the exact
same digit there, multiplying by 10 three
times is the same thing as multiplying by 1,000. So whatever this represents,
multiply it by 1,000, and you're going to get
what this represents.