# Online Pre-Algebra Tutoring: Rounding Off Decimals

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## Learn How to Round off Decimals from Certified Online Pre-Algebra Tutor

Rounding off is a kind of estimating that is the numbers are only approximate.

#### To round off decimals:

- Find the rounding digit and look at the digit just to the right of it. This digit on the right tells us whether to round up or round down.
- If that digit is less than 5, do not change the rounding digit but drop all digits to the right of it that is round down.
- If that digit is greater than or equal to five, add one to the rounding digit and drop all digits to the right of it that is round up.

#### Let’s understand with an example

**What is $ 48.30 rounded to the nearest 10 cents?**

Find the place you want to round. Look one place to the right. If the digit is less than 5, round down. If the digit is 5 or higher, round up.

First, find the digit in the tenths place. This is the place you want to round:

$48.30

Now look one place to the right:

$48.30

0 is less than 5, so you will round down. Replace all the digits to the right of the tenths place by zeroes:

$48.30 → $48.30

**b. What is $835 rounded to the nearest 10 dollars?**

Find the place you want to round. Look one place to the right. If the digit is less than 5, round down. If the digit is 5 or higher, round up.

#### Solve:

First, find the digit in the tens place. This is the place you want to round:

$835

Now look one place to the right:

$835

This number is a 5, so you will round up. First, replace all the digits to the right of the tens place by zeroes:

$835 → $830

Now add 1 to the other part of the number:

$830 → $840

## Check Point

- What is $216.72 rounded to the nearest 10 cents?
- What is $ 47 rounded to the nearest 10 dollars?
- What is $ 799.17 rounded to the nearest dollar?
- What is $276.07 rounded to the nearest 100 dollars?
- What is $8.75 rounded to the nearest 10 cents?

##### Answer key

- $ 216.70
- $ 50
- $ 799.00
- $ 300
- $ 8.80

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