The document provides a series of exercises to calculate percentages of given prices. It lists 5 exercises calculating 50% of 90€, 25% of 40€, 30% of 100€, 10% of 30€, and 20% of 300€. The corrections are then provided, showing the step-by-step workings to calculate each percentage amount.

1. Calcul mental
“Pourcentage d’un prix”
série n°1

2. Pour chaque diapositive,
calculer le pourcentage
du prix écrit.

3. Diapositive 1
50% de 90€

5. Diapositive 2
25% de 40€

7. Diapositive 3
30% de 100€

9. Diapositive 4
10% de 30€

11. Diapositive 5
20% de 300€

13. FIN

14. CORRECTION

15. Diapositive 1
50% de 90€
= 90€ ÷ 2
= 45€

16. Diapositive 1
50% de 90€
= 90€ ÷ 2
= 45€

17. Diapositive 1
50% de 90€
= 90€ ÷ 2
= 45€

18. Diapositive 2
25% de 40€
= 40€ ÷ 4
= 10€

19. Diapositive 2
25% de 40€
= 40€ ÷ 4
= 10€

20. Diapositive 2
25% de 40€
= 40€ ÷ 4
= 10€

21. Diapositive 3
30% de 100€
= (100€ ÷ 100) × 30
= 1€ × 30
= 30€

22. Diapositive 3
30% de 100€
= (100€ ÷ 100) × 30
= 1€ × 30
= 30€

23. Diapositive 3
30% de 100€
= (100€ ÷ 100) × 30
= 1€ × 30
= 30€

24. Diapositive 3
30% de 100€
= (100€ ÷ 100) × 30
= 1€ × 30
= 30€

25. Diapositive 4
10% de 30€
= 30€ ÷ 10
= 3, 0€ = 3€

26. Diapositive 4
10% de 30€
= 30€ ÷ 10
= 3, 0€ = 3€

27. Diapositive 4
10% de 30€
= 30€ ÷ 10
= 3, 0€ = 3€

28. Diapositive 4
10% de 30€
= 30€ ÷ 10
= 3, 0€ = 3€

29. Diapositive 5
20% de 300€
= (300€ ÷ 100) × 20
= 3€ × 20
= 60€

30. Diapositive 5
20% de 300€
= (300€ ÷ 100) × 20
= 3€ × 20
= 60€

31. Diapositive 5
20% de 300€
= (300€ ÷ 100) × 20
= 3€ × 20
= 60€

32. Diapositive 5
20% de 300€
= (300€ ÷ 100) × 20
= 3€ × 20
= 60€