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Nadiya Islam
04/10/2025
Maths
Error intervals
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4 Oct 2025
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How to Calculate Error Intervals with Examples - Fun and Easy Guide!
Nadiya Islam
@nadiyaaa
1 / 4
Practical Application of Error Intervals
This page provides a practical example of how to determine error intervals for a given measurement.
Example: Consider x = 30 cm to the nearest ten.
To find the error interval for this measurement:
- Identify the lower bound: 25 cm (the smallest number that would round up to 30)
- Identify the upper bound: 35 cm (the largest number that would round down to 30)
The error interval is expressed as an inequality:
Highlight: 25 < x < 35
This means that the actual value of x is greater than or equal to 25 cm and strictly less than 35 cm before rounding.
Vocabulary: Lower bound - the smallest possible value before rounding. Vocabulary: Upper bound - the largest possible value before rounding.
Understanding this concept is crucial for calculating error intervals for rounded numbers in various GCSE maths problems and real-world applications.
Determining Error Intervals: Step-by-Step Guide
This page outlines the process for finding error intervals, which is essential for understanding error intervals in math.
-
Identify the place value of the stated degree of accuracy. This determines the interval size for the error interval.
-
For rounded numbers:
- Divide the place value by 2
- Add and subtract this amount from the given value to find the maximum and minimum values
-
For truncated numbers:
- Add the place value to the given value for the maximum
- The given value itself is the minimum
-
Express the error interval as an inequality: Min ≤ x < Max
Highlight: For rounded numbers, the maximum and minimum are referred to as the upper and lower bounds of the number.
Example: If a number is rounded to the nearest ten, the interval size is 5 (half of 10).
This method works for various degrees of accuracy, making it a versatile tool for calculating error intervals for rounded numbers in GCSE maths and beyond.
Vocabulary: Truncation - cutting off digits beyond a certain decimal place without rounding.
Understanding these steps is crucial for using an error interval calculator or solving problems manually.
Practical Example: Error Intervals to 1 Decimal Place
This page demonstrates how to apply the concept of error intervals to a specific example, which is crucial for mastering error intervals examples and understanding error intervals in math worksheets.
Example: A number X is rounded to 1 decimal place (1dp). The result is 8.2. Write down the error interval for X.
To solve this:
- Identify the place value: 0.1 (1 decimal place)
- Calculate the interval: 0.1 ÷ 2 = 0.05
- Find the lower bound: 8.2 - 0.05 = 8.15
- Find the upper bound: 8.2 + 0.05 = 8.25
- Express as an inequality: 8.15 ≤ X < 8.25
Highlight: The error interval 8.15 ≤ X < 8.25 means that X could have been any value from 8.15 (inclusive) up to, but not including, 8.25 before rounding.
This example illustrates how to apply the principles of error intervals to a specific case, which is essential for solving error interval questions and answers in GCSE maths exams and beyond.
Vocabulary: Decimal place - the position of a digit to the right of a decimal point.
Understanding this process is key to using an error interval calculator effectively and solving problems involving error intervals to 2 decimal places or any other degree of accuracy.
Error Intervals: Understanding Limits of Accuracy
Error intervals are a fundamental concept in mathematics, particularly relevant in GCSE maths, that deal with the limits of accuracy when numbers are rounded or truncated. They represent the range of possible values a number could have had before it was rounded or truncated to a specific degree of accuracy.
Definition: Error intervals are the range of possible values that a number could have been before it was rounded or truncated.
To determine error intervals, we consider the smallest and largest numbers that would round or be truncated to a given value for a specific degree of accuracy. This process involves careful consideration of place value and rounding rules.
Highlight: Understanding error intervals is crucial for assessing the precision of measurements and calculations in various fields of study and practical applications.
The concept of error intervals is particularly useful when working with measurements or calculations where exact values are not known or cannot be determined precisely. It allows for a more accurate representation of data and helps in understanding the potential range of true values.
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App Store
4.8/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
How to Calculate Error Intervals with Examples - Fun and Easy Guide!
Nadiya Islam
@nadiyaaa
Error intervals are crucial in understanding the limits of accuracy when dealing with rounded or truncated numbers. This concept is essential in GCSE mathsand beyond, helping students grasp the range of possible values a number could have had before... Show more
Practical Application of Error Intervals
This page provides a practical example of how to determine error intervals for a given measurement.
Example: Consider x = 30 cm to the nearest ten.
To find the error interval for this measurement:
- Identify the lower bound: 25 cm (the smallest number that would round up to 30)
- Identify the upper bound: 35 cm (the largest number that would round down to 30)
The error interval is expressed as an inequality:
Highlight: 25 < x < 35
This means that the actual value of x is greater than or equal to 25 cm and strictly less than 35 cm before rounding.
Vocabulary: Lower bound - the smallest possible value before rounding. Vocabulary: Upper bound - the largest possible value before rounding.
Understanding this concept is crucial for calculating error intervals for rounded numbers in various GCSE maths problems and real-world applications.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Determining Error Intervals: Step-by-Step Guide
This page outlines the process for finding error intervals, which is essential for understanding error intervals in math.
-
Identify the place value of the stated degree of accuracy. This determines the interval size for the error interval.
-
For rounded numbers:
- Divide the place value by 2
- Add and subtract this amount from the given value to find the maximum and minimum values
-
For truncated numbers:
- Add the place value to the given value for the maximum
- The given value itself is the minimum
-
Express the error interval as an inequality: Min ≤ x < Max
Highlight: For rounded numbers, the maximum and minimum are referred to as the upper and lower bounds of the number.
Example: If a number is rounded to the nearest ten, the interval size is 5 (half of 10).
This method works for various degrees of accuracy, making it a versatile tool for calculating error intervals for rounded numbers in GCSE maths and beyond.
Vocabulary: Truncation - cutting off digits beyond a certain decimal place without rounding.
Understanding these steps is crucial for using an error interval calculator or solving problems manually.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Practical Example: Error Intervals to 1 Decimal Place
This page demonstrates how to apply the concept of error intervals to a specific example, which is crucial for mastering error intervals examples and understanding error intervals in math worksheets.
Example: A number X is rounded to 1 decimal place (1dp). The result is 8.2. Write down the error interval for X.
To solve this:
- Identify the place value: 0.1 (1 decimal place)
- Calculate the interval: 0.1 ÷ 2 = 0.05
- Find the lower bound: 8.2 - 0.05 = 8.15
- Find the upper bound: 8.2 + 0.05 = 8.25
- Express as an inequality: 8.15 ≤ X < 8.25
Highlight: The error interval 8.15 ≤ X < 8.25 means that X could have been any value from 8.15 (inclusive) up to, but not including, 8.25 before rounding.
This example illustrates how to apply the principles of error intervals to a specific case, which is essential for solving error interval questions and answers in GCSE maths exams and beyond.
Vocabulary: Decimal place - the position of a digit to the right of a decimal point.
Understanding this process is key to using an error interval calculator effectively and solving problems involving error intervals to 2 decimal places or any other degree of accuracy.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Error Intervals: Understanding Limits of Accuracy
Error intervals are a fundamental concept in mathematics, particularly relevant in GCSE maths, that deal with the limits of accuracy when numbers are rounded or truncated. They represent the range of possible values a number could have had before it was rounded or truncated to a specific degree of accuracy.
Definition: Error intervals are the range of possible values that a number could have been before it was rounded or truncated.
To determine error intervals, we consider the smallest and largest numbers that would round or be truncated to a given value for a specific degree of accuracy. This process involves careful consideration of place value and rounding rules.
Highlight: Understanding error intervals is crucial for assessing the precision of measurements and calculations in various fields of study and practical applications.
The concept of error intervals is particularly useful when working with measurements or calculations where exact values are not known or cannot be determined precisely. It allows for a more accurate representation of data and helps in understanding the potential range of true values.
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
Where can I download the Knowunity app?
You can download the app from Google Play Store and Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.9/5
App Store
4.8/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user