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Table of Contents
Rounding means to convert numbers to simpler numbers so that calculations can be easily performed. In mathematics when we are dealing with numbers and performing operations on them it sometimes gets complicated. To make our calculations easier we use the concept of rounding numbers.
See the fact file below for more information on the rounding numbers. or alternatively, you can download our 28-page Rounding Numbers worksheet pack to utilise within the classroom or home environment. This worksheet is broken down by Beginner, intermediate and advanced meaning you can choose the complexity level for your student.
Key Facts & Information
Summary:
- Rounding means to convert numbers to simpler numbers so that calculations can be easily performed.
- We can round numbers to the nearest tens hundreds and so on.
- We can even round decimal numbers.
- We have to try to the keep number as close as original value to produce accurate results.
- Examples of rounding to the nearest tens:
23 is rounded to 20
27 is rounded to 30 - Examples of rounding to the nearest hundreds:
140 is rounded to 100
270 is rounded to 300
What is rounding?
- In mathematics when we are dealing with numbers and performing operations on them it sometimes gets complicated.
- To make our calculations easier we use the concept of rounding numbers. Our results may not be as accurate and precise as before but it is easier to perform calculations.
- When we are rounding a number what we actually do is that we convert it into a simpler number.
- We have to keep in mind that we should try to keep the number as close as its original value as we can.
How can we round numbers?
- There are many methods used for rounding numbers. The most commonly used method states the following rules:
- Highlight the digit which we do not want to change or up to which we want to round.
- If the next digit has value greater than 5 then increase the previous digit by one.
- If the next digit has value less than 5 then leave the previous digit as it is.
- This concept can be more thoroughly explained with the help of examples given below.
- We can round numbers to the nearest tens, hundreds, thousands and so on. We can even round decimal numbers.
Example:
- Round 54 to the nearest 10.
- We want to round the number to the nearest 10. So we check the digit at ones place.
- The digit at ones place is 4. 4 is less than 5 so no change is needed at the tens place.
- So 54 gets rounded to 50.
- This is called rounding down.
Example:
- Round 57 to the nearest 10.
- We want to round the number to the nearest 10. So we check the digit at ones place.
- The digit at ones place is 7. 7 is greater than 5 so we need to increase the digit at tens place by 1.
- 5 at tens place changes to 6.
- So 57 gets rounded to 60.
- This is called rounding up.
Example:
- Round 460 to the nearest 100.
- We want to round the number to the nearest 100. So we check the digit at tens place.
- The digit at tens place is 6. 6 is greater than 5 so we need to increase the digit at hundreds place by 1.
- 4 at hundreds place changes to 5.
- So 460 gets rounded to 500.
- This is called rounding up.
Example:
- Round 520 to the nearest 100.
- We want to round the number to the nearest 100. So we check the digit at tens place.
- The digit at tens place is 2. 2 is less than 5 so we do not need to change the digit at hundreds place.
- 4 at hundreds stays as it is.
- So 520 gets rounded to 500. This is called rounding down.
Example:
- Round 7230 to the nearest 100.
- We want to round the number to the nearest 100. So we check the digit at tens place.
- The digit at tens place is 3. 3 is smaller than 5 so we do not need to change the digit at hundreds place.
- 2 at hundreds place stays as it is.
- So 7230 gets rounded to 7200.
- This is called rounding down.
Rounding decimal numbers
- We can even round decimal numbers.
- In decimal numbers when we say we want to round the number to tenths it means that we want to keep one digit after the decimal.
- When we say we want to round it to hundredths it means we want to keep two digits after the decimal.
Example:
- Round 5.12 to tenths
- We see that 2 is smaller than 5 so 5.12 will be rounded to 5.1.
Example:
- Round 4.179 to hundredths
- We see that 9 is greater than 5 so 4.179 will round to 4.18.
Rounding Numbers Worksheets
This is a fantastic bundle which includes everything you need to know about rounding numbers across 28 in-depth pages. These are ready-to-use Rounding Numbers worksheets that are perfect for teaching students about the rounding which means to convert numbers to simpler numbers so that calculations can be easily performed. In mathematics when we are dealing with numbers and performing operations on them it sometimes gets complicated. To make our calculations easier we use the concept of rounding numbers.
Complete List Of Included Worksheets
- Worksheet 1 (Beginner)
- Worksheet 2 (Beginner)
- Worksheet 3 (Beginner)
- Worksheet 4 (Beginner
- Worksheet 5 (Intermediate)
- Worksheet 6 (Intermediate)
- Worksheet 7 (Intermediate)
- Worksheet 8 (Intermediate)
- Worksheet 9 (Advance)
- Worksheet 10 (Advance)
- Worksheet 11 (Advance)
- Worksheet 12 (Advance)
Link/cite this page
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Link will appear as Rounding Numbers Worksheets: https://kidskonnect.com - KidsKonnect, March 6, 2019
Use With Any Curriculum
These worksheets have been specifically designed for use with any international curriculum. You can use these worksheets as-is, or edit them using Google Slides to make them more specific to your own student ability levels and curriculum standards.