Loading please wait

The smart way to improve grades

Comprehensive & curriculum aligned

Try an activity or get started for free

Use Rounding to the Nearest Hundred to Check that Answers are Reasonable

In this worksheet, students will learn how to round numbers to the nearest hundred in order to check that answers are reasonable.

'Use Rounding to the Nearest Hundred to Check that Answers are Reasonable' worksheet

Key stage:  KS 2

Year:  Year 5 Maths worksheets

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Use Rounding for Answers/Accuracy

Difficulty level:  

Worksheet Overview

When adding and subtracting larger numbers it can be useful to be able to check to see if our answers are reasonable. 

Rounding the numbers we are adding/subtracting is a useful way of doing this.

 

In this activity, we will be looking at how to round numbers to the nearest 100 in order to check that answers to addition and subtraction questions are reasonable.

 

girl thinking

 

Rules for rounding to the nearest 100:

When rounding to the nearest 100, we look at the tens digit.

 

If the tens digit is less than 5, the number is rounded down.

If the tens digit is 5 or more, the number is rounded up.

Any digit in the ones column becomes a zero.

 

Let's look at some examples of rounding to the nearest 100.

Remember, we look at the tens column.

 

744 would be rounded down to 700 because there is a 4 in the tens column.

751 would be rounded up to 800 because there is a 5 in the tens column.

8,264 would be rounded up to 8,300  because there is a 6 in the tens column (even though this is a 4-digit number, we are still rounding to the nearest 100)

 

Now let's use rounding to check if the answer to a subtraction is reasonable:

 

1,232 - 673 = 559

 

Now, let's round the numbers:

 

1,232  rounds down to 1,200 (there is a 3 in the tens column)

673 rounds up to 700 (there is a 7 in the tens column)

 

1,200 - 700 = 500

 

So, 559 is a reasonable answer to the original question.

 

Now, it's your turn to have a go at some questions!

 

Don't forget - some will be addition and others subtraction!

 

boy with football

What is EdPlace?

We're your National Curriculum aligned online education content provider helping each child succeed in English, maths and science from year 1 to GCSE. With an EdPlace account you’ll be able to track and measure progress, helping each child achieve their best. We build confidence and attainment by personalising each child’s learning at a level that suits them.

Get started
laptop

Try an activity or get started for free

  • National Tutoring Awards 2023 Shortlisted / Parents
    National Tutoring Awards 2023 Shortlisted
  • Private-Tutoring-WINNER-EducationInvestor-Awards / Parents
    Winner - Private Tutoring
  • Bett Awards Finalist / Parents
    Finalist
  • Winner - Best for Home Learning / Parents
    Winner - Best for Home Learning / Parents