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Updated Mar 23, 2026
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Výpočty Percent a Promile: Jednoduchý Sprievodca
1 / 7
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!
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the 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 Matematika
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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
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
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
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
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 app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
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
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
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
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
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 app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
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!
Sign up to see the contentIt's free!
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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!
Sign up to see the contentIt's free!
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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 specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the 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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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
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
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
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
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 app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
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
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
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
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
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 app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user