cm

1. Calcul mental
N°18
“Fraction de durée”

2. Diapositive 1Diapositive 1
Calculer le temps.
5
de 16min
8

4. Diapositive 2Diapositive 2
Calculer le temps.
3
de 21s
7

6. Diapositive 3Diapositive 3
Calculer le temps.
2
de 1h
3

8. Diapositive 4Diapositive 4
Calculer le temps.
3
de 28min
4

10. Diapositive 5Diapositive 5
Calculer le temps.
4
de 15h
5

11. FIN

12. CORRECTION

13. Diapositive 1Diapositive 1
( )
= ×
= ÷ ×
= × =
5 5
de 16min 16min
8 8
16min 8 5
2min 5 10min

14. Diapositive 2Diapositive 2
( )
= ×
= ÷ ×
= × =
3 3
de 21s 21s
7 7
21s 7 3
3s 3 9s

15. Diapositive 3Diapositive 3
( )
= ×
= ÷ ×
= × =
2 2
de 1h 1h
3 3
60min 3 2
20min 2 40min

16. Diapositive 4Diapositive 4
( )
= ×
= ÷ ×
= × =
3 3
de 28min 28min
4 4
28min 4 3
7min 3 21min

17. Diapositive 5Diapositive 5
( )
= ×
= ÷ ×
= × =
4 4
de 15h 15h
5 5
15h 5 4
3h 4 12h