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Round Decimals to One Decimal Place

In this worksheet, students will be asked to round decimal numbers with two decimal places, to one decimal place.

'Round Decimals to One Decimal Place' worksheet

Key stage:  KS 2

Curriculum topic:   Number: Fractions, Decimals and Percentages

Curriculum subtopic:   Round Up/Down Decimals

Difficulty level:  

Worksheet Overview

QUESTION 1 of 10

Remember, numbers with 2 decimal places have 2 digits after the decimal point.

 

Rounding Rules:

To round a number with 2 decimal places, look at the second digit after the decimal point.

Numbers whose 2nd decimal place is 0, 1, 2, 3, 4, round DOWN.

Numbers whose 2nd decimal place is 5, 6, 7, 8, 9, round UP.

Halfway numbers such as 7.55 round UP.

 

Example 1:

Round 6.46 to one decimal place.

First, look at the digit 6 = 6 hundredths. Because it is more than 5, so more than 5 hundredths, we need to round up.

Answer = 6.5

 

Example 2:

 

Round 12.83 to one decimal place.

Look at the digit 3 = 3 hundredths. Because it is less than 5, so less than 5 hundredths, we round down.

Answer = 12.8

 

It's that simple!

Round the decimal number below to one decimal place.

 

9.42

9.0

9.6

9.4

9.5

Round this decimal number to one decimal place.

 

7.67

7.6

7.7

7.8

7.65

Below is a list of numbers with 2 decimal places.

 

Each number has been rounded to 1 decimal place.

 

Can you match each number correctly?

Column A

Column B

2.87
9.1
1.13
1.1
6.45
2.9
9.09
6.5

Below is a list of numbers with 2 decimal places.

 

Each number has been rounded to 1 decimal place.

 

Can you match each number correctly?

Column A

Column B

3.16
3.2
3.66
3.7
3.27
3.3
3.41
3.4

Round this decimal number to one decimal place:

 

22.64

 

Round the decimal number below to one decimal place.

 

134.69

 

Round this decimal number to one decimal place.

 

2.99

 

Round both of the decimal numbers below to one decimal place.

 

16.27

16.31

 

Then, identify which number is bigger when rounded.

They're the same

16.27

16.32

Round both of the decimal numbers below to one decimal place.

 

4.99

5.11

 

Then, choose which number is bigger when rounded.

5.11

They're the same.

4.90

In the long jump event on Sports Day, Lucy jumped 1.28 m and Laura jumped 1.18 m.

 

Round each of their results to one decimal place.

 

Then record the name of the person who jumped the greatest distance.

  • Question 1

Round the decimal number below to one decimal place.

 

9.42

CORRECT ANSWER
9.4
EDDIE SAYS
How did you get on with this first question? 9.42 rounded to one decimal place is 9.4 This is because the 2nd digit after the decimal place is 2 hundredths, as it's less than 5 hundredths, we round down.
  • Question 2

Round this decimal number to one decimal place.

 

7.67

CORRECT ANSWER
7.7
EDDIE SAYS
How was your rounding this time? 7.67 rounded to one decimal place is 7.7 This is because the 2nd digit after the decimal place is 7 hundredths, as this is higher than 5 hundredths, we round up.
  • Question 3

Below is a list of numbers with 2 decimal places.

 

Each number has been rounded to 1 decimal place.

 

Can you match each number correctly?

CORRECT ANSWER

Column A

Column B

2.87
2.9
1.13
1.1
6.45
6.5
9.09
9.1
EDDIE SAYS
There were a lot of tricky numbers to consider there! Here are the numbers rounded correctly to one decimal place: 2.87 = 2.9 (round up) 1.13 = 1.1 (round down) 6.45 = 6.5 (round up) 9.09 = 9.1 (round up) Take a deep breath, you've got this.
  • Question 4

Below is a list of numbers with 2 decimal places.

 

Each number has been rounded to 1 decimal place.

 

Can you match each number correctly?

CORRECT ANSWER

Column A

Column B

3.16
3.2
3.66
3.7
3.27
3.3
3.41
3.4
EDDIE SAYS
How did you find matching the pairs this time? Here are the correctly rounded numbers to one decimal place: 3.16 = 3.2 (round up) 3.66 = 3.7 (round up) 3.27 = 3.3 (round up) 3.41 = 3.4 (round down) Is this becoming less daunting?
  • Question 5

Round this decimal number to one decimal place:

 

22.64

 

CORRECT ANSWER
22.6
EDDIE SAYS
When we round 22.64 to one decimal place we get the answer 22.6. This is because the 2nd digit after the decimal place is 4 hundredths, as this is less than 5 hundredths, we round down.
  • Question 6

Round the decimal number below to one decimal place.

 

134.69

 

CORRECT ANSWER
134.7
EDDIE SAYS
When we round 134.69 to one decimal place, we find the answer 134.7. This is because, the 2nd digit after the decimal place is 9 hundredths, as this is greater than 5 hundredths, we round up.
  • Question 7

Round this decimal number to one decimal place.

 

2.99

 

CORRECT ANSWER
3
3.0
EDDIE SAYS
How did you get on with this one? I bet you had to think about it! 2.99 rounds up to 3.0 when rounding to 1 decimal place. This is because the 2nd digit after the decimal place is 9, so we round up. The first digit after the decimal place is 9 tenths so we round that up too, which turns the following 2 digits into 3.
  • Question 8

Round both of the decimal numbers below to one decimal place.

 

16.27

16.31

 

Then, identify which number is bigger when rounded.

CORRECT ANSWER
They're the same
EDDIE SAYS
16.27 and 16.31, when rounded to one decimal place, both round to 16.3 16.27 is rounded up as the 2nd digit after the decimal place is 7 hundredths, which is larger than 5 hundredths. 16.31 is rounded down as the 2nd digit after the decimal place is 1 hundredth, which is less than 5 hundredths. So, the correct answer is they're the same! Well done if you didn't get thrown off by the wording of this question.
  • Question 9

Round both of the decimal numbers below to one decimal place.

 

4.99

5.11

 

Then, choose which number is bigger when rounded.

CORRECT ANSWER
5.11
EDDIE SAYS
When the decimal numbers are rounded to one decimal place, 4.99 = 5.0 and 5.11 = 5.1 So, the correct answer and the greatest number is 5.11 4.99 is rounded up to 5.0 as the 2nd digit after the decimal place is 9 hundredths, which is greater than 5 hundredths. 5.11 is rounded down to 5.1, as the 2nd digit after the decimal place is 1 hundredth, which is less than 5 hundredths. Hopefully, this is like second nature to you now!
  • Question 10

In the long jump event on Sports Day, Lucy jumped 1.28 m and Laura jumped 1.18 m.

 

Round each of their results to one decimal place.

 

Then record the name of the person who jumped the greatest distance.

CORRECT ANSWER
Lucy
EDDIE SAYS
When both results are rounded, we find the following numbers: Lucy 1.28 m = 1.3 m Laura 1.18 m = 1.2 m Therefore, Lucy jumped the furthest, even after the results have been rounded to one decimal place. Practice makes perfect! That’s another activity ticked off!
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