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Maths
13 Dec 2025
172
2 pages
๐ชธ๐Maya K๐๐ชธ @pawz.z
Decimals might seem tricky at first, but they're actually just another way to write numbers - and once... Show more
The secret to adding and subtracting decimals is all about lining things up properly - think of it like parking cars in designated spaces! You need to make sure the decimal points sit directly under each other, with units under units and tenths under tenths.
When you're adding numbers like 3.42 + 1.7, don't panic about the different lengths. Simply add a zero to make 1.7 become 1.70 - this makes the calculation much clearer. Your sum becomes 3.42 + 1.70 = 5.12, and you're sorted!
Subtraction works exactly the same way - line up those decimal points first. For 7.43 - 2.59, you might need to borrow from the column to the left, just like with whole numbers. Remember, if one number has fewer decimal places, add zeros to match the other number's length.
Top Tip Always double-check your decimal point alignment before you start calculating - it's the most common mistake students make!
Multiplying decimals is simpler than you think - just ignore the decimal points completely at first! Multiply the numbers as if they were whole numbers, then count up all the decimal places in both original numbers. Your final answer needs exactly that many decimal places.
For example, 4.5 ร 2.4 becomes 45 ร 24 = 1080. Since you had one decimal place in each number (that's 2 total), your answer is 10.8. Easy!
Dividing decimals requires a clever trick - turn the division into a fraction first. Then multiply both the top and bottom by 10, 100, or 1000 until you've eliminated all decimal points. So 5.4 รท 0.06 becomes 540 รท 6 = 90.
When converting between fractions, decimals and percentages, remember the simple rules multiply by 100 to go from decimal to percentage, divide by 100 to go the other way. For fractions, divide the top by the bottom to get a decimal.
Remember Practice makes perfect - try these techniques with your pocket money calculations to see decimals in action!
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.
You can download the app from Google Play Store and Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help โ all at your fingertips.
2
Smart Tools NEW
Transform this note into: โ 50+ Practice Questions โ Interactive Flashcards โ Full Mock Exam โ Essay Outlines
This summary covers the essential concepts of ordering decimals and understanding place value. Learn how to compare decimal numbers, convert between decimals, fractions, and percentages, and the significance of each digit's place value. Ideal for students looking to enhance their numeracy skills in mathematics.
MathsExplore effective techniques for multiplying decimals, including step-by-step calculations and the importance of decimal placement. This summary covers key concepts such as handling decimal points, examples of multiplication with decimals, and tips for accurate results. Ideal for students looking to master decimal multiplication.
MathsMaster the process of converting recurring decimals to fractions with this step-by-step guide. This resource covers essential techniques, including setting up equations and simplifying results, tailored for GCSE Maths Foundation and Higher students. Ideal for exam preparation and practice.
MathsEnhance your skills in multiplication and division with this comprehensive GCSE arithmetic practice. This resource covers key operations including adding and multiplying decimals, as well as division methods. Perfect for exam preparation, it includes a variety of questions with clear instructions and marks allocation. Ideal for students aiming to improve their mathematical proficiency.
MathsExplore the principles of discrete growth and decay through practical examples of percentage calculations, including compound interest and depreciation. This summary covers key concepts such as percent increase, percent decrease, and how to apply these in real-life scenarios. Ideal for students looking to master financial mathematics.
MathsMaster the essential arithmetic operations with decimals: addition, subtraction, multiplication, and division. This summary covers techniques for using BIDMAS and provides clear examples to enhance your understanding. Perfect for Year 8 students looking to strengthen their math skills.
MathsApp Store
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 itโs 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 didnโt even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as Iโm 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 ๐๐๐ฒ๐ค๐โจ๐๐ฎ
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 itโs 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 didnโt even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as Iโm 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 ๐๐๐ฒ๐ค๐โจ๐๐ฎ
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
๐ชธ๐Maya K๐๐ชธ
@pawz.z
Decimals might seem tricky at first, but they're actually just another way to write numbers - and once you master the basics, you'll find them everywhere in real life, from money to measurements. Let's break down the essential skills you... Show more
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Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
The secret to adding and subtracting decimals is all about lining things up properly - think of it like parking cars in designated spaces! You need to make sure the decimal points sit directly under each other, with units under units and tenths under tenths.
When you're adding numbers like 3.42 + 1.7, don't panic about the different lengths. Simply add a zero to make 1.7 become 1.70 - this makes the calculation much clearer. Your sum becomes 3.42 + 1.70 = 5.12, and you're sorted!
Subtraction works exactly the same way - line up those decimal points first. For 7.43 - 2.59, you might need to borrow from the column to the left, just like with whole numbers. Remember, if one number has fewer decimal places, add zeros to match the other number's length.
Top Tip: Always double-check your decimal point alignment before you start calculating - it's the most common mistake students make!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Multiplying decimals is simpler than you think - just ignore the decimal points completely at first! Multiply the numbers as if they were whole numbers, then count up all the decimal places in both original numbers. Your final answer needs exactly that many decimal places.
For example, 4.5 ร 2.4 becomes 45 ร 24 = 1080. Since you had one decimal place in each number (that's 2 total), your answer is 10.8. Easy!
Dividing decimals requires a clever trick - turn the division into a fraction first. Then multiply both the top and bottom by 10, 100, or 1000 until you've eliminated all decimal points. So 5.4 รท 0.06 becomes 540 รท 6 = 90.
When converting between fractions, decimals and percentages, remember the simple rules: multiply by 100 to go from decimal to percentage, divide by 100 to go the other way. For fractions, divide the top by the bottom to get a decimal.
Remember: Practice makes perfect - try these techniques with your pocket money calculations to see decimals in action!
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.
You can download the app from Google Play Store and Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help โ all at your fingertips.
2
Smart Tools NEW
Transform this note into: โ 50+ Practice Questions โ Interactive Flashcards โ Full Mock Exam โ Essay Outlines
This summary covers the essential concepts of ordering decimals and understanding place value. Learn how to compare decimal numbers, convert between decimals, fractions, and percentages, and the significance of each digit's place value. Ideal for students looking to enhance their numeracy skills in mathematics.
MathsExplore effective techniques for multiplying decimals, including step-by-step calculations and the importance of decimal placement. This summary covers key concepts such as handling decimal points, examples of multiplication with decimals, and tips for accurate results. Ideal for students looking to master decimal multiplication.
MathsMaster the process of converting recurring decimals to fractions with this step-by-step guide. This resource covers essential techniques, including setting up equations and simplifying results, tailored for GCSE Maths Foundation and Higher students. Ideal for exam preparation and practice.
MathsEnhance your skills in multiplication and division with this comprehensive GCSE arithmetic practice. This resource covers key operations including adding and multiplying decimals, as well as division methods. Perfect for exam preparation, it includes a variety of questions with clear instructions and marks allocation. Ideal for students aiming to improve their mathematical proficiency.
MathsExplore the principles of discrete growth and decay through practical examples of percentage calculations, including compound interest and depreciation. This summary covers key concepts such as percent increase, percent decrease, and how to apply these in real-life scenarios. Ideal for students looking to master financial mathematics.
MathsMaster the essential arithmetic operations with decimals: addition, subtraction, multiplication, and division. This summary covers techniques for using BIDMAS and provides clear examples to enhance your understanding. Perfect for Year 8 students looking to strengthen their math skills.
MathsApp Store
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 itโs 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 didnโt even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as Iโm 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 ๐๐๐ฒ๐ค๐โจ๐๐ฎ
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 itโs 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 didnโt even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as Iโm 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 ๐๐๐ฒ๐ค๐โจ๐๐ฎ
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
Sociology