Round to 1 decimal place
for 4th grade

How to round decimals to 1 decimal place (1 dp)

Rounding is a helpful technique that makes numbers simpler and easier to work with. By rounding, we find a number that's close to the original number but not as precise. This makes it more convenient for estimating and solving problems.

When rounding decimals to the nearest tenth (1 decimal place, 1 dp), we look at the second decimal place (the hundredths column) to help us decide if the first decimal place (the tenths) should stay the same or go up by one. The rules for deciding are:

• If the second decimal place (hundredths) is 5 or greater (5, 6, 7, 8, or 9), round the first decimal place (tenths) up by one.
• If the second decimal place (hundredths) is less than 5 (0, 1, 2, 3, or 4), the first decimal place (tenths) stays the same.

For example, what is 3.24 rounded to 1 decimal place?

Look at the second decimal place (hundredths): it's 4, which is less than 5. So, the first decimal place (tenths) stays the same. The rounded number is 3.2.

What is 7.681 rounded to 1 decimal place?

Look at the second decimal place (hundredths): it's 8, which is 5 or greater. So, we round the first decimal place (tenths) up by one. The rounded number is 7.7.

In this topic you are asked to round decimal numbers to 1 decimal place. The numbers range from 22.93 to 55.5423.