How to Round Numbers to One Decimal Place

Rounding numbers to one decimal place is a common mathematical operation that simplifies numbers for easier understanding and use. Here’s how you can do it:

1. Identify the Decimal Place: Look at the number and identify the first digit after the decimal point. This is the tenths place.
2. Look at the Next Digit: Check the digit immediately to the right of the tenths place. This is the hundredths place.
3. Apply the Rounding Rule:
   • If the hundredths digit is 5 or greater, round the tenths digit up by one.
   • If the hundredths digit is less than 5, leave the tenths digit unchanged.
4. Write the Rounded Number: After rounding, write the number with only one digit after the decimal point.

Example:

Let’s round the number 3.47 to one decimal place.

1. The tenths digit is 4.
2. The hundredths digit is 7.
3. Since 7 is greater than 5, we round the tenths digit up by one, making it 5.
4. The rounded number is 3.5.

This method ensures that numbers are simplified while maintaining their approximate value.