Zaokrúhľovanie desatinných čísel je ako "česanie" čísel - robíme ich... Show more
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Updated Mar 15, 2026
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Jednoduché zaokrúhľovanie desatinných čísel
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Čo je zaokrúhľovanie desatinných čísel
Určite už vieš zaokrúhľovať celé čísla na desiatky či stovky. Pri desatinných číslach je to veľmi podobné, len musíš dávať pozor na desatinnú čiarku a miesta za ňou.
Najprve si pripomeň základy. Desatinné číslo má celú časť a desatinnú časť oddelené čiarkou (napríklad 3,14). Desatinné miesta sú cifry za čiarkou - číslo 3,14 má dve desatinné miesta.
Zaokrúhľovanie znamená, že zmeníš číslo na jednoduchšie, ale stále mu blízke. Napríklad 3,47 môžeš zaokrúhliť na 3,5. Je to menej presné, ale oveľa jednoduchšie na prácu.
Tip: Zaokrúhľovanie používame hlavne pri práci s peniazmi alebo meraniami, kde nepotrebujeme absolútnu presnosť!
Ako zaokrúhľovať - základné pravidlá
Zaokrúhľovanie má jednoduché pravidlá, ktoré fungujú vždy. Najskôr si urči, na koľko desatinných miest zaokrúhľuješ - na jedno (desatiny), dve (stotiny) alebo tri (tisíciny).
Potom postupuj v troch krokoch. Prvý: nájdi cifru na mieste, kam zaokrúhľuješ. Druhý: pozri sa na cifru hneď za ňou (o jedno miesto doprava). Tretí: použi pravidlo.
Pravidlo je jednoduché: Ak je cifra za zaokrúhľovaným miestom 0, 1, 2, 3 alebo 4, zaokrúhľované miesto zostane rovnaké. Ak je to 5, 6, 7, 8 alebo 9, zaokrúhľované miesto sa zväčší o jedna.
Pozor: Pri desatinných číslach cifry za zaokrúhľovaným miestom jednoducho odpadnú, nenahrádzajú sa nulami ako pri celých číslach!
Riešené príklady krok za krokom
Pozrime si, ako to funguje v praxi. Zaokrúhli 3,47 na jedno desatinné miesto. Prvé desatinné miesto je cifra 4, za ňou je cifra 7. Pretože 7 je väčšie ako 5, cifra 4 sa zväčší na 5. Výsledok: 3,5.
Skúsme zaokrúhliť 12,032 na dve desatinné miesta. Druhé desatinné miesto je cifra 3, za ňou je cifra 2. Pretože 2 je menšie ako 5, cifra 3 zostane rovnaká. Výsledok: 12,03.
Špeciálny prípad: zaokrúhli 0,98 na jedno desatinné miesto. Prvé desatinné miesto je 9, za ním 8. Cifra 9 sa má zväčšiť, ale 9+1=10. Zapíšeme 0 a 1 pripočítame k celej časti. Výsledok: 1,0.
Dôležité: Pri výsledku 1,0 nezabudni napísať nulu - ukazuje to, že si zaokrúhľoval na jedno desatinné miesto!
Časté chyby a užitočné tipy
Najväčšia chyba je pozeranie na zlú cifru. Vždy sa pozeraj na cifru hneď za miestom, na ktoré zaokrúhľuješ, nie na iné! Ak zaokrúhľuješ na desatiny, pozri sa na stotiny.
Druhá častá chyba je pri čítaní zadania. Poriadne si prečítaj, či máš zaokrúhliť na desatiny, stotiny alebo tisíciny. Každé má iné miesto!
Zaokrúhľovanie sa hodí pri počítaní peňazí (centy), odhadovaní výsledkov alebo meraní, kde nepotrebuješ super presnú hodnotu. V reálnom živote je to veľmi praktické.
Pamätaj si: Pravidlo "5 a viac zaokrúhľujeme nahor" platí rovnako pre desatinné čísla aj celé čísla!
Rýchly súhrn na test
Tu je všetko, co potrebuješ vedieť na test o zaokrúhľovaní desatinných čísel. Tri kroky: urči miesto zaokrúhľovania, pozri sa na cifru za ním, použi pravidlo.
Pravidlá: Cifry 0-4 znamenajú "nechaj ako je", cifry 5-9 znamenajú "zväčši o jedna". Cifry za zaokrúhľovaným miestom jednoducho odpadnú.
Špeciálny prípad: ak sa cifra zväčší na 10, napíš 0 a prenies 1 na predchádzajúce miesto. Napríklad 0,98 → 1,0.
Pro tip: Cvič si rôzne príklady a vždy kontroluj, či si sa pozrel na správnu cifru. To je kľúč k úspechu!
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Where can I download the Knowunity app?
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4.6/5
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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
Jednoduché zaokrúhľovanie desatinných čísel
Zaokrúhľovanie desatinných čísel je ako "česanie" čísel - robíme ich jednoduchšími, ale stále blízkymi pôvodnému číslu. Je to super užitočné pri počítaní peňazí, meraní alebo kedykoľvek nepotrebuješ úplne presnú hodnotu.
Čo je zaokrúhľovanie desatinných čísel
Určite už vieš zaokrúhľovať celé čísla na desiatky či stovky. Pri desatinných číslach je to veľmi podobné, len musíš dávať pozor na desatinnú čiarku a miesta za ňou.
Najprve si pripomeň základy. Desatinné číslo má celú časť a desatinnú časť oddelené čiarkou (napríklad 3,14). Desatinné miesta sú cifry za čiarkou - číslo 3,14 má dve desatinné miesta.
Zaokrúhľovanie znamená, že zmeníš číslo na jednoduchšie, ale stále mu blízke. Napríklad 3,47 môžeš zaokrúhliť na 3,5. Je to menej presné, ale oveľa jednoduchšie na prácu.
Tip: Zaokrúhľovanie používame hlavne pri práci s peniazmi alebo meraniami, kde nepotrebujeme absolútnu presnosť!
Sign up to see the contentIt's free!
Access to all documents
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Ako zaokrúhľovať - základné pravidlá
Zaokrúhľovanie má jednoduché pravidlá, ktoré fungujú vždy. Najskôr si urči, na koľko desatinných miest zaokrúhľuješ - na jedno (desatiny), dve (stotiny) alebo tri (tisíciny).
Potom postupuj v troch krokoch. Prvý: nájdi cifru na mieste, kam zaokrúhľuješ. Druhý: pozri sa na cifru hneď za ňou (o jedno miesto doprava). Tretí: použi pravidlo.
Pravidlo je jednoduché: Ak je cifra za zaokrúhľovaným miestom 0, 1, 2, 3 alebo 4, zaokrúhľované miesto zostane rovnaké. Ak je to 5, 6, 7, 8 alebo 9, zaokrúhľované miesto sa zväčší o jedna.
Pozor: Pri desatinných číslach cifry za zaokrúhľovaným miestom jednoducho odpadnú, nenahrádzajú sa nulami ako pri celých číslach!
Sign up to see the contentIt's free!
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Riešené príklady krok za krokom
Pozrime si, ako to funguje v praxi. Zaokrúhli 3,47 na jedno desatinné miesto. Prvé desatinné miesto je cifra 4, za ňou je cifra 7. Pretože 7 je väčšie ako 5, cifra 4 sa zväčší na 5. Výsledok: 3,5.
Skúsme zaokrúhliť 12,032 na dve desatinné miesta. Druhé desatinné miesto je cifra 3, za ňou je cifra 2. Pretože 2 je menšie ako 5, cifra 3 zostane rovnaká. Výsledok: 12,03.
Špeciálny prípad: zaokrúhli 0,98 na jedno desatinné miesto. Prvé desatinné miesto je 9, za ním 8. Cifra 9 sa má zväčšiť, ale 9+1=10. Zapíšeme 0 a 1 pripočítame k celej časti. Výsledok: 1,0.
Dôležité: Pri výsledku 1,0 nezabudni napísať nulu - ukazuje to, že si zaokrúhľoval na jedno desatinné miesto!
Sign up to see the contentIt's free!
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Časté chyby a užitočné tipy
Najväčšia chyba je pozeranie na zlú cifru. Vždy sa pozeraj na cifru hneď za miestom, na ktoré zaokrúhľuješ, nie na iné! Ak zaokrúhľuješ na desatiny, pozri sa na stotiny.
Druhá častá chyba je pri čítaní zadania. Poriadne si prečítaj, či máš zaokrúhliť na desatiny, stotiny alebo tisíciny. Každé má iné miesto!
Zaokrúhľovanie sa hodí pri počítaní peňazí (centy), odhadovaní výsledkov alebo meraní, kde nepotrebuješ super presnú hodnotu. V reálnom živote je to veľmi praktické.
Pamätaj si: Pravidlo "5 a viac zaokrúhľujeme nahor" platí rovnako pre desatinné čísla aj celé čísla!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Rýchly súhrn na test
Tu je všetko, co potrebuješ vedieť na test o zaokrúhľovaní desatinných čísel. Tri kroky: urči miesto zaokrúhľovania, pozri sa na cifru za ním, použi pravidlo.
Pravidlá: Cifry 0-4 znamenajú "nechaj ako je", cifry 5-9 znamenajú "zväčši o jedna". Cifry za zaokrúhľovaným miestom jednoducho odpadnú.
Špeciálny prípad: ak sa cifra zväčší na 10, napíš 0 a prenies 1 na predchádzajúce miesto. Napríklad 0,98 → 1,0.
Pro tip: Cvič si rôzne príklady a vždy kontroluj, či si sa pozrel na správnu cifru. To je kľúč k úspechu!
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.
4.6/5
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