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## MAP Recommended Practice

### Course: MAP Recommended Practice>Unit 38

Lesson 2: Ones and tens

# Place value example: 25

Sal shows 25 as 2 tens and 5 ones. Created by Sal Khan.

## Want to join the conversation?

• does Sal split the numbers up so that people can understand what it really means?
• Yes. To help give you intuition behind the number and place value of numbers.
• So, how did we start grouping by 10's. It couldn't been something like binary, so why tens? Was it because we have 10 fingers?
• It is because we have ten fingers! ancient people would use the different parts of their bodies to count. They would start with their fingers, then toes, then limbs, then head.
• Wait, so there's Place value example: 25, so where's Place value example: 24?
How does that Work?
• If I am reading your question correctly, you are asking what the place value for 24 is, right?

If you had the number 134, it would go in like this:
Hundreds | Tens | Ones
--------1------------3--------4
Because there is 1 in the hundreds place, 3 in the tens place, and 4 in the ones place.

For 24 it would look like this:
Tens | Ones
---2-------4
Because there are 2 tens, and 4 ones.

Let me give you one more example. For the number 397:
Hundreds | Tens | Ones
------3------------9-------7

Here in the hundreds place we see 3. If 2 were there, the number would be 297 instead of 397. In the tens place there is the number 9. That number tells us to say eighty, fifty, thirty, or any other ty number. In this case, the nine in the tens place makes it 90. Finally in the ones place we have 7. This tells you what 0-9 number goes on the end of 397.

I hope this helped you!
(1 vote)
• what is the 1's for place value in the number 300
• 300 consists of 3 hundreds, 0 tens, and 0 ones.

0 ones = 0,
so the 0 in the ones place has a place value of 0.
• what is the value of 3 in the number 36
(1 vote)
• Hi Eva!

The number 3 is in the tens place. 6 is in the ones place. Hope this helps!
• What does it mean when Sal shows 25 as 2 tens and 5 ones.?:)
(1 vote)
• The number 25 can be thought of as 2 groups of ten items plus 5 groups of 1 item(s). If it was money, a quarter (25 cents) could be represented as 2 dimes (2 groups of ten) and 5 pennies (5 groups of 1).
• what grade is this for because it is really easy for me but i still have not mastered all of it so should i finish it?
(1 vote)
• This is grades kindergarten through 2nd grade, also known as early math. If you want to find your grade, the scroll up, and click subject. If you put the arrow over math, then you'll find all the grades. Click your grade and start learning!
(1 vote)
• is the metric system the new American measuring system? Because I know that all it is is tens and zeros to make uneducated peoples' lives simpler.
(1 vote)
• The USA officially uses the imperial system. However, the metric system is often used, even in the USA, because the units are easier to understand and work with.
(1 vote)
• why do we have to group them?