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Updated Mar 25, 2026
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Výpočty Percent a Promile: Jednoduchý Sprievodca
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Percentá a promile - základy
Predstav si, že máš čokoládu rozdelenú na 100 kúskov. Jedno percento (%) je presne jeden z týchto kúskov. Slovo percento znamená "zo sta", takže 1% = 1/100 = 0,01.
Základ je to najdôležitejšie - je to tvoja celá čokoláda, teda vždy 100%. Percentová časť je to, čo skutočne dostaneš (napríklad 20 kúskov z tej čokolády). Počet percent ti povie, aká veľká je táto časť v percentách.
Promile (‰) funguje podobne, len miesto 100 kúskov máš 1000. Používa sa, keď sú časti veľmi malé - napríklad pri alkoholiteste. 1‰ = 1/1000 = 0,001.
💡 Tip: Vždy si najprv ujasni, čo je v úlohe základ (100%)!
Ako počítať percentovú časť
Chceš zistiť, koľko je napríklad 20% zo 150 €? Najjednoduchšie je použiť trojčlenku - funguje vždy a všade!
Zapíšeš si: 100% je 150 €, koľko je 20%? Postavíš rovnicu: x/150 = 20/100. Po vyriešení dostaneš x = 30 €.
Druhý spôsob je cez desatinné čísla. Prevedieš 20% na 0,20 a vynásobíš: 0,20 × 150 = 30 €. Oba spôsoby dajú rovnaký výsledok.
Pri percentuálnom náraste (napríklad cena sa zvýši o 10%) použiješ vzorec: pôvodná cena × (1 + 0,10). Pri poklese (zľava 10%): pôvodná cena × (1 - 0,10).
💡 Pamätaj si: Nárast znamená plus, pokles znamená mínus!
Výpočet základu a počtu percent
Niekedy nevieš, aký veľký je celok. Napríklad: 45 € je 30% z nejakej sumy - koľko je tá celá suma? Opäť použiješ trojčlenku: 30% je 45 €, 100% je x €.
Po vyriešení dostaneš x = 150 €. Alebo jednoducho vydelíš: 45 ÷ 0,30 = 150 €.
Pre výpočet počtu percent postupuješ podobne. Ak chceš vedieť, koľko percent je 60 zo 400, vydelíš: 60 ÷ 400 = 0,15. Potom 0,15 × 100 = 15%.
Promile počítaš rovnako, len namiesto 100 používaš 1000. Napríklad 3‰ z 2000 litrov: x/2000 = 3/1000, takže x = 6 litrov.
💡 Kontrola: Vždy si skontroluj, či tvoj výsledok dáva zmysel!
Praktické príklady z života
Predstav si, že v triede je 25 žiakov a 40% sú dievčatá. Koľko je to dievčat? Použiješ trojčlenku: 100% je 25 žiakov, 40% je x žiakov. Výsledok: 10 dievčat.
Pri nákupoch sa percentá používajú často. Tenisky za 60 € majú zľavu 25%. Najprv vypočítaš zľavu: 25% z 60 € = 15 €. Potom odčítaš: 60 - 15 = 45 €.
Ešte jednoduchšie je rovno počítať, koľko platíš: 100% - 25% = 75%. Takže 75% z 60 € = 45 €.
Promile stretneš napríklad pri soli v minerálke. Ak je vo fľaši 0,2‰ soli a fľaša má 500 g, je v nej 0,1 g soli, čo je 100 mg.
💡 V obchode: Zľava 25% znamená, že platíš 75% z pôvodnej ceny!
Prevody a praktické tipy
Prevod percent na desatinné čísla je jednoduchý: delíš 100. Takže 25% = 0,25, 5% = 0,05. Pri promile delíš 1000: 25‰ = 0,025.
Opačne: desatinné číslo na percentá násobíš 100, na promile násobíš 1000.
Užitočné skratky: 50% = polovica, 25% = štvrtina, 10% = desatina. Pri 10% jednoducho posunie čiarku o jedno miesto doľava: 10% zo 180 = 18.
Kontrolné otázky: Je môj výsledok menší ako základ? (Pri percentovej časti by mal byť.) Je rozumný? (Zľava nemôže byť väčšia ako pôvodná cena.)
Pamätaj si, že percentá a promile sú len rôzne spôsoby vyjadrenia častí celku. S trochou cvičenia budeš počítať rýchlo a presne!
💡 Pre kalkulačku: Percentá prevádzaj na desatinné čísla - bude to rýchlejšie!
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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
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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
Výpočty Percent a Promile: Jednoduchý Sprievodca
Percentá vidíš všade okolo seba - v obchodoch pri zľavách, v správach o voľbách alebo v škole pri hodnotení testov. Pochopenie percent a promile ti pomôže lepšie rozumieť číslam v každodennom živote a úspešne riešiť matematické úlohy.
Percentá a promile - základy
Predstav si, že máš čokoládu rozdelenú na 100 kúskov. Jedno percento (%) je presne jeden z týchto kúskov. Slovo percento znamená "zo sta", takže 1% = 1/100 = 0,01.
Základ je to najdôležitejšie - je to tvoja celá čokoláda, teda vždy 100%. Percentová časť je to, čo skutočne dostaneš (napríklad 20 kúskov z tej čokolády). Počet percent ti povie, aká veľká je táto časť v percentách.
Promile (‰) funguje podobne, len miesto 100 kúskov máš 1000. Používa sa, keď sú časti veľmi malé - napríklad pri alkoholiteste. 1‰ = 1/1000 = 0,001.
💡 Tip: Vždy si najprv ujasni, čo je v úlohe základ (100%)!
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Ako počítať percentovú časť
Chceš zistiť, koľko je napríklad 20% zo 150 €? Najjednoduchšie je použiť trojčlenku - funguje vždy a všade!
Zapíšeš si: 100% je 150 €, koľko je 20%? Postavíš rovnicu: x/150 = 20/100. Po vyriešení dostaneš x = 30 €.
Druhý spôsob je cez desatinné čísla. Prevedieš 20% na 0,20 a vynásobíš: 0,20 × 150 = 30 €. Oba spôsoby dajú rovnaký výsledok.
Pri percentuálnom náraste (napríklad cena sa zvýši o 10%) použiješ vzorec: pôvodná cena × (1 + 0,10). Pri poklese (zľava 10%): pôvodná cena × (1 - 0,10).
💡 Pamätaj si: Nárast znamená plus, pokles znamená mínus!
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Výpočet základu a počtu percent
Niekedy nevieš, aký veľký je celok. Napríklad: 45 € je 30% z nejakej sumy - koľko je tá celá suma? Opäť použiješ trojčlenku: 30% je 45 €, 100% je x €.
Po vyriešení dostaneš x = 150 €. Alebo jednoducho vydelíš: 45 ÷ 0,30 = 150 €.
Pre výpočet počtu percent postupuješ podobne. Ak chceš vedieť, koľko percent je 60 zo 400, vydelíš: 60 ÷ 400 = 0,15. Potom 0,15 × 100 = 15%.
Promile počítaš rovnako, len namiesto 100 používaš 1000. Napríklad 3‰ z 2000 litrov: x/2000 = 3/1000, takže x = 6 litrov.
💡 Kontrola: Vždy si skontroluj, či tvoj výsledok dáva zmysel!
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Praktické príklady z života
Predstav si, že v triede je 25 žiakov a 40% sú dievčatá. Koľko je to dievčat? Použiješ trojčlenku: 100% je 25 žiakov, 40% je x žiakov. Výsledok: 10 dievčat.
Pri nákupoch sa percentá používajú často. Tenisky za 60 € majú zľavu 25%. Najprv vypočítaš zľavu: 25% z 60 € = 15 €. Potom odčítaš: 60 - 15 = 45 €.
Ešte jednoduchšie je rovno počítať, koľko platíš: 100% - 25% = 75%. Takže 75% z 60 € = 45 €.
Promile stretneš napríklad pri soli v minerálke. Ak je vo fľaši 0,2‰ soli a fľaša má 500 g, je v nej 0,1 g soli, čo je 100 mg.
💡 V obchode: Zľava 25% znamená, že platíš 75% z pôvodnej ceny!
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Prevody a praktické tipy
Prevod percent na desatinné čísla je jednoduchý: delíš 100. Takže 25% = 0,25, 5% = 0,05. Pri promile delíš 1000: 25‰ = 0,025.
Opačne: desatinné číslo na percentá násobíš 100, na promile násobíš 1000.
Užitočné skratky: 50% = polovica, 25% = štvrtina, 10% = desatina. Pri 10% jednoducho posunie čiarku o jedno miesto doľava: 10% zo 180 = 18.
Kontrolné otázky: Je môj výsledok menší ako základ? (Pri percentovej časti by mal byť.) Je rozumný? (Zľava nemôže byť väčšia ako pôvodná cena.)
Pamätaj si, že percentá a promile sú len rôzne spôsoby vyjadrenia častí celku. S trochou cvičenia budeš počítať rýchlo a presne!
💡 Pre kalkulačku: Percentá prevádzaj na desatinné čísla - bude to rýchlejšie!
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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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