Expressions avec Nombres et Pourcentages | Seconde
Introduction
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Introduction aux Expressions Numériques
Qu'est-ce qu'une expression numérique ?
Les expressions avec nombres et pourcentages sont des constructions linguistiques qui permettent d'exprimer des quantités précises ou approximatives en anglais.
Elles sont utilisées pour communiquer des données statistiques, des proportions, des quantités exactes ou approximatives.
- Expression de pourcentage - pour indiquer des proportions
- Expression de nombre exact - pour des quantités précises
- Expression de nombre approximatif - pour des estimations
- Expression de proportion - pour comparer des quantités
Expressions avec Pourcentages
Utilisation des pourcentages
- Number + percent : 25 percent, 50 percent
- Number + per cent : 25 per cent, 50 per cent (orthographe britannique)
- Number + % : 25%, 50% (abrégé)
- Exemple : Twenty-five percent of students passed the exam.
- Thirty percent of the population lives in rural areas. (30%)
- About fifty percent of the work is completed. (50%)
- Only ten percent of the students attended the lecture. (10%)
- More than seventy-five percent of the respondents agreed. (75%)
- About 40 percent of the voters supported the proposal.
- Approximately 60 percent of the budget was allocated to education.
- Over 80 percent of the products were sold online.
- Nearly 90 percent of the staff participated in the training.
Expressions avec Nombres Exactes
Utilisation des nombres exacts
- Cardinal numbers : one, two, three, four, five...
- Ordinal numbers : first, second, third, fourth, fifth...
- Large numbers : hundred, thousand, million, billion
- Exemple : Five students attended the meeting.
- Twelve people were invited to the party.
- The company employs three hundred and fifty workers.
- This project took two years to complete.
- The city has a population of four million residents.
- 100 = one hundred
- 1,000 = one thousand
- 10,000 = ten thousand
- 1,000,000 = one million
- 1,000,000,000 = one billion
Expressions avec Nombres Approximatifs
Utilisation des nombres approximatifs
- About / Around : environ
- Approximately : approximativement
- Nearly : presque
- Almost : presque
- Just over / Just under : légèrement plus/moins
- About fifty people attended the event. (Environ 50)
- Approximately one hundred students registered. (Environ 100)
- Nearly two thousand tickets were sold. (Presque 2000)
- Just over thirty percent supported the proposal. (Légèrement plus de 30%)
- Exact : One hundred students enrolled. (100)
- Approximate : About one hundred students enrolled. (~100)
- Exact : Twenty-five percent passed. (25%)
- Approximate : Just over twenty percent passed. (>20%)
Expressions avec Proportions
Utilisation des proportions
- Half : moitié
- A quarter : un quart
- Three quarters : trois quarts
- One in ten : un sur dix
- Two out of three : deux sur trois
- Half of the students passed the exam. (50%)
- A quarter of the budget was allocated to research. (25%)
- Three quarters of the population supports the policy. (75%)
- One in ten people suffer from allergies. (10%)
- Two out of three doctors recommend this treatment. (66.6%)
- More than half of the participants agreed.
- Less than a quarter of the budget was spent.
- Most students prefer online learning.
- Several teachers attended the conference.
Tableau Récapitulatif
Guide de référence rapide
| Type | Expression | Exemple | Traduction |
|---|---|---|---|
| Pourcentage | 25 percent | 25% of students passed | 25% des étudiants ont réussi |
| Nombre exact | One hundred | One hundred people | Cent personnes |
| Approximation | About fifty | About fifty students | Environ cinquante étudiants |
| Proportion | Half | Half of the group | La moitié du groupe |
- Pourcentages : number + percent/%
- Nombres exacts : cardinal/ordinal numbers
- Approximations : about, approximately, nearly, almost
- Proportions : half, quarter, one in ten, two out of three
Exercice 1: Choix d'Expressions Numériques
Exercice de choix
Complétez les phrases suivantes avec la bonne expression numérique :
- About _______ people attended the conference. (100/1000)
- _______ percent of the population voted in favor. (50/75)
- _______ of the students passed the exam. (Half/A quarter)
- The company employs _______ workers. (three hundred/three million)
- _______ of the budget was allocated to education. (Two thirds/Two millions)
Solution Exercice 1
Correction détaillée
- About one thousand people attended the conference. (1000 est plus logique pour une conférence)
- Seventy-five percent of the population voted in favor. (75% est plus précis que 50%)
- Half of the students passed the exam. (moitié est une proportion)
- The company employs three hundred workers. (300 est plus plausible que 3 millions pour une entreprise)
- Two thirds of the budget was allocated to education. (fraction est plus appropriée que millions)
Exercice 2: Classification
Exercice de classification
Classez les expressions suivantes selon leur type (pourcentage, nombre exact, approximation, proportion) :
- Twenty-five percent
- About three hundred
- Half
- One thousand
- Approximately fifty
- Three quarters
- Eighty-seven percent
- Just over twenty
Solution Exercice 2
Correction détaillée
- Pourcentage: Twenty-five percent, Eighty-seven percent
- Nombre exact: One thousand
- Approximation: About three hundred, Approximately fifty, Just over twenty
- Proportion: Half, Three quarters
Exercice 3: Transformation
Exercice de transformation
Transformez les expressions suivantes en changeant leur forme (nombre exact → approximation, pourcentage → proportion, etc.) :
- One hundred students → About _______ students
- Twenty-five percent → _______ of the students
- Half the population → _______ percent of the population
- About fifty people → Nearly _______ people
- Three quarters of the votes → _______ percent of the votes
Solution Exercice 3
Correction détaillée
- One hundred students → About one hundred students
- Twenty-five percent → A quarter of the students
- Half the population → Fifty percent of the population
- About fifty people → Nearly fifty people
- Three quarters of the votes → Seventy-five percent of the votes
Résumé
Points clés
- Structure : number + percent/%
- Exemples : 25 percent, 50%, seventy-five percent
- Usage : pour indiquer des proportions précises
- Structure : cardinal/ordinal numbers
- Exemples : one, two, three hundred, one thousand
- Usage : pour des quantités précises
- Mots : about, approximately, nearly, almost
- Exemples : about fifty, nearly one thousand
- Usage : pour des estimations
- Expressions : half, quarter, one in ten, two out of three
- Usage : pour comparer des quantités
- Traduction : moitié, quart, un sur dix, deux sur trois
Conclusion
Félicitations !
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