Calculer des hausses et baisses en pourcentage % 📈📉 sans calculatrice 💪 Brevet Bac 🚀 ♕

In this video, you'll learn how to calculate percentage increases and decreases without a calculator, using simple and effective methods. 👉 We'll look at the most common scenarios: 20% increase followed by a 10% decrease 10% increase followed by a 20% decrease 20% increase followed by a 20% decrease 25% increase followed by a 20% decrease 💡 You'll understand why an increase followed by a decrease of the same percentage doesn't bring the price back to the original amount and how to avoid common pitfalls. 🎯 This video is ideal for middle and high school students, and for successfully completing exercises without a calculator.