In this activity, we will learn how to round a decimal number to the nearest whole number.

Method

To round a decimal to the nearest whole number, check the digit in the tenths column.

If the tenths digit is 5 or more, round up.

If the tenths digit is 4 or less, round down.

Examples

19.742 is between the whole numbers 19 and 20.

The 7 tenths tells us to round up to 20.

19.742 rounds up to 20.

19.342 is between the whole numbers 19 and 20.

The 3 tenths tells us to round down to 19.

19.342 rounds down to 19.

 Are you ready to start rounding some decimals?