cm

1. Calcul mental
n°28
“Des proportions ”

2. Calculer lesCalculer les
deux tiersdeux tiers
de 90.de 90.
Diapositive 1Diapositive 1

4. CalculerCalculer
5% de 70.5% de 70.
Diapositive 2Diapositive 2

6. Compléter :Compléter :
Diapositive 3Diapositive 3
=
9
...%
25

8. Compléter :Compléter :
Diapositive 4Diapositive 4
=
3 21
7 ...

10. Compléter :Compléter :
Diapositive 5Diapositive 5
=
20 ...
5 7

12. FIN

13. CORRECTION

14. Diapositive 1Diapositive 1
× = × =
2
90 2 30
3
60

15. Diapositive 2Diapositive 2
× = ×
= =
5
5% 70 70
100
350
100
3,5

16. Diapositive 3Diapositive 3
×
=
×
= =
9 9 4
25 25 4
36
100
36%

17. Diapositive 4Diapositive 4
=
3 21
7 49

18. Diapositive 5Diapositive 5
= =
20
4
5
28
7