Savez-vous que tu utilises les nombres relatifstous les jours... Show more
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Updated Mar 10, 2026
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Apprendre l'Addition et la Soustraction des Nombres Relatifs
1 / 10
Le sous-marin et les profondeurs
Imagine un sous-marin qui plonge et remonte dans l'océan - c'est exactement comme ça que fonctionnent les nombres relatifs ! Quand le sous-marin descend, on soustrait (la profondeur devient plus négative), et quand il remonte, on additionne.
Partons de -50m de profondeur. Le sous-marin descend de 25m : -50 - 25 = -75m. Puis il remonte de 10m : -75 + 10 = -65m. Enfin, il redescend de 40m : -65 - 40 = -105m.
Règle importante : quand tu additionnes deux nombres négatifs, tu additionnes leurs valeurs absolues et tu gardes le signe négatif. Quand tu additionnes un négatif et un positif, tu soustrais le plus petit du plus grand et tu prends le signe du plus grand !
💡 Astuce : L'opposé d'un nombre, c'est juste changer son signe. L'opposé de -105 est +105 !
Les transactions bancaires
Ton compte en banque fonctionne exactement comme les nombres relatifs ! Un dépôt, c'est une addition, et un retrait, c'est une soustraction. C'est aussi simple que ça.
Commence avec -120€ (tu es dans le rouge). Tu fais un dépôt de 250€ : -120 + 250 = 130€. Puis un retrait de 80€ : 130 - 80 = 50€. Enfin, un autre dépôt de 45€ : 50 + 45 = 95€.
Pour calculer la différence entre ton solde final et initial, tu fais : 95 - (-120) = 95 + 120 = 215€. Ton compte a donc augmenté de 215€ !
💡 Rappel : Soustraire un nombre négatif, c'est comme ajouter son opposé. C'est pour ça que -(-120) devient +120 !
La droite graduée et les distances
Sur une droite graduée, calculer une distance entre deux points, c'est un jeu d'enfant avec la valeur absolue ! Tu traces ta droite, tu places le 0 au centre, les positifs à droite et les négatifs à gauche.
Place le point A à -7 et le point B à +3. Pour trouver la distance entre eux, utilise la formule : |xB - xA| = |3 - (-7)| = |3 + 7| = |10| = 10.
Maintenant, si tu veux créer une expression avec l'opposé de A et la valeur absolue de B : opposé de -7 = +7, et |3| = 3. Donc 7 + 3 = 10.
💡 Retiens bien : La distance entre deux points est toujours positive, c'est pourquoi on utilise la valeur absolue !
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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
Apprendre l'Addition et la Soustraction des Nombres Relatifs
Savez-vous que tu utilises les nombres relatifstous les jours sans t'en rendre compte ? Quand tu descends au sous-sol (nombres négatifs) ou quand tu comptes tes économies après avoir dépensé de l'argent ! Ce cours va t'apprendre à maîtriser... Show more
Le sous-marin et les profondeurs
Imagine un sous-marin qui plonge et remonte dans l'océan - c'est exactement comme ça que fonctionnent les nombres relatifs ! Quand le sous-marin descend, on soustrait (la profondeur devient plus négative), et quand il remonte, on additionne.
Partons de -50m de profondeur. Le sous-marin descend de 25m : -50 - 25 = -75m. Puis il remonte de 10m : -75 + 10 = -65m. Enfin, il redescend de 40m : -65 - 40 = -105m.
Règle importante : quand tu additionnes deux nombres négatifs, tu additionnes leurs valeurs absolues et tu gardes le signe négatif. Quand tu additionnes un négatif et un positif, tu soustrais le plus petit du plus grand et tu prends le signe du plus grand !
💡 Astuce : L'opposé d'un nombre, c'est juste changer son signe. L'opposé de -105 est +105 !
Sign up to see the contentIt's free!
Access to all documents
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Les transactions bancaires
Ton compte en banque fonctionne exactement comme les nombres relatifs ! Un dépôt, c'est une addition, et un retrait, c'est une soustraction. C'est aussi simple que ça.
Commence avec -120€ (tu es dans le rouge). Tu fais un dépôt de 250€ : -120 + 250 = 130€. Puis un retrait de 80€ : 130 - 80 = 50€. Enfin, un autre dépôt de 45€ : 50 + 45 = 95€.
Pour calculer la différence entre ton solde final et initial, tu fais : 95 - (-120) = 95 + 120 = 215€. Ton compte a donc augmenté de 215€ !
💡 Rappel : Soustraire un nombre négatif, c'est comme ajouter son opposé. C'est pour ça que -(-120) devient +120 !
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
La droite graduée et les distances
Sur une droite graduée, calculer une distance entre deux points, c'est un jeu d'enfant avec la valeur absolue ! Tu traces ta droite, tu places le 0 au centre, les positifs à droite et les négatifs à gauche.
Place le point A à -7 et le point B à +3. Pour trouver la distance entre eux, utilise la formule : |xB - xA| = |3 - (-7)| = |3 + 7| = |10| = 10.
Maintenant, si tu veux créer une expression avec l'opposé de A et la valeur absolue de B : opposé de -7 = +7, et |3| = 3. Donc 7 + 3 = 10.
💡 Retiens bien : La distance entre deux points est toujours positive, c'est pourquoi on utilise la valeur absolue !
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
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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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