Rounding Numbers

Sometimes, we do not need to work with very accurate numbers. For example, suppose that the attendance at a football match was 26,239. Most people may just want to know there were 26,000 at the football match instead of the exact number.

We can round off large numbers to the nearest thousand, nearest hundred, nearest ten, or any other specified place value.

Rounding Numbers To The Nearest Ten

Example:

Round 378 to the nearest ten.

Solution:

To round off to the nearest ten, we look at the ones digit.

In the number 378, the ones digit is bigger than 5, so we round up to 380

378 is 380 when rounded off to the nearest ten.

Remember :

The rule is - if the digit to the right of the rounding place is:

5 or more, round up
4 or less, round down

 

Example:

1 653 is 1 650 when rounded off to the nearest ten.

53 745 is 53 750 when rounded off to the nearest ten.

The following video shows more examples of rounding numbers to the nearest 10.

Rounding Numbers To The Nearest Hundred

Example:

Round 1 243 to the nearest hundred.

Solution:

To round off to the nearest hundred, we look at the tens digit.

In the number 1 243, the tens digit is less than 5, so we round down to 1 200.

1 243 is 1 200 when rounded off to the nearest hundred.

Example:

37 084 is 37 100 when rounded off to the nearest hundred.

54 253 is 54 300 when rounded off to the nearest hundred.

Rounding Numbers To The Nearest Thousand

Example:

Round 46 225 to the nearest thousand.

Solution:

To round off to the nearest thousand, we look at the hundreds digit.

In the number 46 225, the hundreds digit is less than 5, so we round down to 46 000.

46 225 is 46 000 when rounded off to the nearest thousand.

Example:

53 609 is 54 000 when rounded off to the nearest thousand.

36 529 is 37 000 when rounded off to the nearest thousand.

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