AlgèbreFacile
Math Learning PlatformPercentages
Beginner
📚 pourcentages
📖 About this lesson
Understand and calculate percentages easily
Lesson Content
Percentages
A percentage represents a ,[object Object],.
What is a percentage?
50% = 50100 = 0.5
Calculating a percentage
To calculate x% of y: (x100) × y
[object Object], 20% of 50 = (20100) × 50 = 0.2 × 50 = 10
Increase and decrease
10% increase:
New price = Price × 1.10
20% decrease:
New price = Price × 0.80
Practical tip
10% = divide by 1050% = divide by 225% = divide by 4
Practical Examples
1
Example 1
📋 Problem
Calculer 30% de 80
✅ Solution
24
💡 Explanation
30% de 80 = (30100) × 80 = 0.3 × 80 = 24
2
Example 2
📋 Problem
Un article coûte 60$. Il y a une réduction de 25%. Quel est le nouveau prix ?
✅ Solution
45$
💡 Explanation
25% de 60 = 15. Nouveau prix = 60 - 15 = 45$