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## 4th grade

### Unit 1: Lesson 5

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
- Place value when multiplying and dividing by 10
- Place value when multiplying and dividing by 10

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# Understanding place value

Sal discusses how a digit in one place represents ten times what it represents in the place to its right. Created by Sal Khan.

## Want to join the conversation?

- Isn't pre algebra for 7th graders? My school makes it where if your in 6th grade advanced math, you get to do pre algebra in 7th grade and Algebra in 8th grade.(12 votes)
- writes 3500 ones in figures(7 votes)
- I would like to thank all of you guys for all the help.(15 votes)

- im 9 and i know division i love divison its teaching me everything im 9 in the fourth grade hi(11 votes)
- I don't understand the question which involve LEFT.

someone here to assist me.(8 votes)- hey imagin theres 1 arrow going left and another one facing right and there a number like this one here 450 add that number with this one here 390 add them from right to left bc the anwser is gonno be 840(2 votes)

- hi guys im sorry this is not a question but i just wanted to apologize once again for not giving you stars i really did not mean it . it was by a mistake pleasee dont fire anyone . thanks bye(8 votes)
- that looks like it was made in 2012 💀(6 votes)
- If its in a different place but its the same number you use that tool to help(6 votes)
- oh now i understand(5 votes)
- What type of person do not ask questions on the place value topic(5 votes)
- Im struggling with understanding place value and place value multiplying and dividing by 10(4 votes)
- Let's say you have a number 0001.0000 (the zeroes before and after the one don't hold any value) if you were to multiply this number by 10 you would move the decimal to the right once so the new number would be 00010.00 multiply it by 10 again and you get 000100.0(2 votes)

## Video transcript

The 4 in the number
5,634 is blank times blank than the 4 in
the number 12,749. So let's think about
what they're saying. So the 4 in the number 5,634,
that's literally in the ones place. It literally just represents 4. Now, the 4 in the number 12,749,
that 4 is in the tens place. It represents 40. So this 4, it's a 10 times
smaller value than this 4. Or this 4, I should say. This 4 right over
here represents 4, while this represents 40. So it is 10 times smaller
than the 4 in 12,749. 4 by itself is 10
times smaller than 40. Make sure I got
the right answer. Let's do another one. In the number 3,779,264,
how many times less is the value of the second 7
than the value of the first 7? How many times less is
the value of the second 7 than the value of the first 7? So the second 7 right over here,
that's in the ten thousands place. It literally represents 70,000,
7 ten thousands, or 70,000, while this represents 700
thousands, or 700,000. So the second 7 is 1/10
the value of the first 7. Or another way of thinking,
it's 10 times less. This is 70,000, and
this is 700,000. So the value of the
second 7 is 10 times less than the value of the first 7. Let's do one more. This is fun. Fill in the following
blanks to complete the relationships
between 25,430 and 2,543. All right, so 25,430 is 10
times larger than 2,543. Literally, you take this,
you multiply it by 10, you're going to get 25,430. The digits in
25,430 are one place to the blank of the digits
in the number 2,543. Well, let's think about it. Here you have a 2 in
the thousands place. Here you have a 2 in
the ten thousands place. Here you have a 5 in
the hundreds place. Here you have a 5 in
the thousands place. And we could keep going. But what we see is a
corresponding digit. In 25,430, they're one place
to the left of the digits right over here. Now, finally, we're
going to take 25,430 and divide it by 2,543. Well, we already know that the
first number is 10 times larger than this number
right over here. So literally, if you divide the
smaller number into the larger one, you're going to get 10. This right over here is
10 times larger than this. So that was the first part of
the question, and we are done.