Rekenen met breuken en kommagetallen lijkt misschien ingewikkeld, maar het... Show more
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Updated Apr 8, 2026
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Breuken en Kommagetallen Begrijpen - Praktische Tips
1 / 10
Leerdoelen en Overzicht
Je gaat leren hoe je breuken omzet naar kommagetallen en andersom, zodat je altijd de makkelijkste vorm kunt kiezen voor je berekening. Ook leer je alle vier de rekenkundige bewerkingen met breuken en kommagetallen.
Bij praktische problemen zoals het verdelen van pizza of het aanpassen van recepten, kun je straks moeiteloos kiezen of je met breuken of kommagetallen werkt. De bewerkingsvolgorde toepassen wordt een fluitje van een cent.
Handig om te weten: Breuken en kommagetallen stellen precies hetzelfde voor - het zijn gewoon verschillende manieren om een getal op te schrijven!
Breuken en Kommagetallen Begrijpen
Een breuk bestaat uit een teller (bovenaan) en een noemer (onderaan). De noemer zegt in hoeveel stukken iets verdeeld is, de teller hoeveel stukken je hebt.
Een breuk omzetten naar kommagetal doe je door de teller te delen door de noemer. Bijvoorbeeld: 3/4 = 3 ÷ 4 = 0,75. Als je een pizza in 8 stukken verdeelt en 3 stukken opeet, heb je 3/8 = 0,375 van de pizza gegeten.
Kommagetallen omzetten naar breuken werkt andersom. Bij één cijfer achter de komma gebruik je 10 als noemer, bij twee cijfers 100, enzovoort. Daarna vereenvoudig je: 0,25 = 25/100 = 1/4.
Let op: Je kunt altijd controleren of je omzetting klopt door de breuk weer terug te delen!
Optellen en Aftrekken van Breuken
Bij het optellen en aftrekken van breuken moeten de noemers altijd gelijk zijn. Als ze dat al zijn, tel je gewoon de tellers op: 2/5 + 1/5 = 3/5.
Hebben de breuken verschillende noemers? Dan zoek je eerst het kleinste gemeenschappelijke veelvoud (KGV) van beide noemers. Bij 1/3 + 1/4 is dat 12, dus wordt het 4/12 + 3/12 = 7/12.
Een praktijkvoorbeeld: je hebt 3/4 liter melk en gebruikt 1/3 liter voor een recept. Er blijft over: 3/4 - 1/3 = 9/12 - 4/12 = 5/12 liter. Aftrekken werkt precies hetzelfde als optellen.
Ezelsbruggetje: Gelijke noemers = makkelijk rekenen. Ongelijke noemers = eerst gelijk maken!
Vermenigvuldigen van Breuken
Vermenigvuldigen van breuken is eigenlijk het makkelijkst van allemaal. Je vermenigvuldigt gewoon teller × teller en noemer × noemer: 2/3 × 3/4 = 6/12 = 1/2.
Slimmer rekenen doe je door vooraf te vereenvoudigen. Bij 4/9 × 3/8 kun je 4 en 8 delen door 4, en 3 en 9 door 3. Dan krijg je 1/3 × 1/2 = 1/6.
Een breuk vermenigvuldigen met een heel getal is simpel: vermenigvuldig alleen de teller. Voor 6 personen in plaats van 4 heb je 2/3 × 6 = 12/3 = 4 liter bouillon nodig.
Onthoud: Bij vermenigvuldigen hoef je geen gemeenschappelijke noemer te zoeken - dat scheelt een hoop werk!
Delen van Breuken
Delen door een breuk is hetzelfde als vermenigvuldigen met het omgekeerde van die breuk. Het omgekeerde van 3/4 is 4/3 - je wisselt teller en noemer gewoon om.
Dus: 3/4 ÷ 2/5 = 3/4 × 5/2 = 15/8. Waarom werkt dit? Delen door 1/2 betekent: "hoeveel halve delen passen erin?" Dat is hetzelfde als × 2.
Praktijkvoorbeeld: uit 3/4 meter stof wil je stukken van 1/8 meter knippen. Aantal stukken: 3/4 ÷ 1/8 = 3/4 × 8/1 = 6 stukken. Heel getal delen door breuk doe je door het hele getal eerst als breuk te schrijven: 6 ÷ 2/3 = 6/1 × 3/2 = 9.
Trucje: "Delen wordt vermenigvuldigen met omgekeerde" - zeg dit een paar keer hardop, dan onthoud je het!
Rekenen met Kommagetallen
Bij kommagetallen optellen en aftrekken zet je de getallen onder elkaar met de komma's precies onder elkaar. Dan reken je kolom voor kolom: 12,75 + 3,8 = 16,55.
Vermenigvuldigen met kommagetallen doe je in drie stappen: tel eerst alle cijfers achter de komma . Vermenigvuldig dan alsof het hele getallen zijn: 25 × 12 = 300. Plaats tenslotte de komma: 3,00 = 3.
Bij delen van kommagetallen werk je de komma's weg door beide getallen met 10, 100 of 1000 te vermenigvuldigen. Zo wordt 7,2 ÷ 1,8 gewoon 72 ÷ 18 = 4.
Handig: Kommagetallen zijn vaak sneller dan breuken, vooral bij complexe berekeningen!
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.
Most popular content in Rekenen
Can't find what you're looking for? Explore other subjects.
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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 Knowunity AI. 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 Knowunity AI. 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
Breuken en Kommagetallen Begrijpen - Praktische Tips
Rekenen met breuken en kommagetallen lijkt misschien ingewikkeld, maar het is eigenlijk heel logisch als je de trucjes kent. Deze gids laat je zien hoe je gemakkelijk kunt omzetten tussen breuken en kommagetallen, en hoe je ermee kunt rekenen in... Show more
Leerdoelen en Overzicht
Je gaat leren hoe je breuken omzet naar kommagetallen en andersom, zodat je altijd de makkelijkste vorm kunt kiezen voor je berekening. Ook leer je alle vier de rekenkundige bewerkingen met breuken en kommagetallen.
Bij praktische problemen zoals het verdelen van pizza of het aanpassen van recepten, kun je straks moeiteloos kiezen of je met breuken of kommagetallen werkt. De bewerkingsvolgorde toepassen wordt een fluitje van een cent.
Handig om te weten: Breuken en kommagetallen stellen precies hetzelfde voor - het zijn gewoon verschillende manieren om een getal op te schrijven!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Breuken en Kommagetallen Begrijpen
Een breuk bestaat uit een teller (bovenaan) en een noemer (onderaan). De noemer zegt in hoeveel stukken iets verdeeld is, de teller hoeveel stukken je hebt.
Een breuk omzetten naar kommagetal doe je door de teller te delen door de noemer. Bijvoorbeeld: 3/4 = 3 ÷ 4 = 0,75. Als je een pizza in 8 stukken verdeelt en 3 stukken opeet, heb je 3/8 = 0,375 van de pizza gegeten.
Kommagetallen omzetten naar breuken werkt andersom. Bij één cijfer achter de komma gebruik je 10 als noemer, bij twee cijfers 100, enzovoort. Daarna vereenvoudig je: 0,25 = 25/100 = 1/4.
Let op: Je kunt altijd controleren of je omzetting klopt door de breuk weer terug te delen!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Optellen en Aftrekken van Breuken
Bij het optellen en aftrekken van breuken moeten de noemers altijd gelijk zijn. Als ze dat al zijn, tel je gewoon de tellers op: 2/5 + 1/5 = 3/5.
Hebben de breuken verschillende noemers? Dan zoek je eerst het kleinste gemeenschappelijke veelvoud (KGV) van beide noemers. Bij 1/3 + 1/4 is dat 12, dus wordt het 4/12 + 3/12 = 7/12.
Een praktijkvoorbeeld: je hebt 3/4 liter melk en gebruikt 1/3 liter voor een recept. Er blijft over: 3/4 - 1/3 = 9/12 - 4/12 = 5/12 liter. Aftrekken werkt precies hetzelfde als optellen.
Ezelsbruggetje: Gelijke noemers = makkelijk rekenen. Ongelijke noemers = eerst gelijk maken!
Sign up to see the contentIt's free!
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Vermenigvuldigen van Breuken
Vermenigvuldigen van breuken is eigenlijk het makkelijkst van allemaal. Je vermenigvuldigt gewoon teller × teller en noemer × noemer: 2/3 × 3/4 = 6/12 = 1/2.
Slimmer rekenen doe je door vooraf te vereenvoudigen. Bij 4/9 × 3/8 kun je 4 en 8 delen door 4, en 3 en 9 door 3. Dan krijg je 1/3 × 1/2 = 1/6.
Een breuk vermenigvuldigen met een heel getal is simpel: vermenigvuldig alleen de teller. Voor 6 personen in plaats van 4 heb je 2/3 × 6 = 12/3 = 4 liter bouillon nodig.
Onthoud: Bij vermenigvuldigen hoef je geen gemeenschappelijke noemer te zoeken - dat scheelt een hoop werk!
Sign up to see the contentIt's free!
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Improve your grades
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Delen van Breuken
Delen door een breuk is hetzelfde als vermenigvuldigen met het omgekeerde van die breuk. Het omgekeerde van 3/4 is 4/3 - je wisselt teller en noemer gewoon om.
Dus: 3/4 ÷ 2/5 = 3/4 × 5/2 = 15/8. Waarom werkt dit? Delen door 1/2 betekent: "hoeveel halve delen passen erin?" Dat is hetzelfde als × 2.
Praktijkvoorbeeld: uit 3/4 meter stof wil je stukken van 1/8 meter knippen. Aantal stukken: 3/4 ÷ 1/8 = 3/4 × 8/1 = 6 stukken. Heel getal delen door breuk doe je door het hele getal eerst als breuk te schrijven: 6 ÷ 2/3 = 6/1 × 3/2 = 9.
Trucje: "Delen wordt vermenigvuldigen met omgekeerde" - zeg dit een paar keer hardop, dan onthoud je het!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Rekenen met Kommagetallen
Bij kommagetallen optellen en aftrekken zet je de getallen onder elkaar met de komma's precies onder elkaar. Dan reken je kolom voor kolom: 12,75 + 3,8 = 16,55.
Vermenigvuldigen met kommagetallen doe je in drie stappen: tel eerst alle cijfers achter de komma . Vermenigvuldig dan alsof het hele getallen zijn: 25 × 12 = 300. Plaats tenslotte de komma: 3,00 = 3.
Bij delen van kommagetallen werk je de komma's weg door beide getallen met 10, 100 of 1000 te vermenigvuldigen. Zo wordt 7,2 ÷ 1,8 gewoon 72 ÷ 18 = 4.
Handig: Kommagetallen zijn vaak sneller dan breuken, vooral bij complexe berekeningen!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
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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Most popular content in Rekenen
Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5
App Store
4.7/5
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 Knowunity AI. 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 Knowunity AI. 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