Calcul mental “Fraction d’une durée”

Pour chaque diapositive,

effectuer les calculs suivants …

5 de 16min

8

Diapositive 1Diapositive 1

3 de 21 s

7

Diapositive 2Diapositive 2

2 de 1 h

3

Diapositive 3Diapositive 3

3 de 28min

4

Diapositive 4Diapositive 4

4 de 15 h

5

Diapositive 5Diapositive 5

FIN

CORRECTION

(16min 8) 5

2min 5

5 de

10mi

16min8

n

÷ ×

= ×=

=

Diapositive 1Diapositive 1

2mi

5 de 16min (16

n 5 1

min 8) 5

m

8

0 in= ×=

= ÷ ×

Diapositive 1Diapositive 1

5 de 16min (16min 8) 5

8

2m

in 5 10min

= ÷

=

×

= ×

Diapositive 1Diapositive 1

5 de 16min (16min 8) 5

8 2min 5 10min

= ÷ ×

= ×=

Diapositive 1Diapositive 1

(21 s 7) 3

3 s 3

3

de 2

9 s

1 s7

÷ ×

= ×=

=

Diapositive 2Diapositive 2

3

3 de 21 s (21 s

s 3

7

)

9

37

s= ×=

= ÷ ×

Diapositive 2Diapositive 2

3 de 21 s (21 s 7) 3

7

3 s 3 9 s

= ×

=

÷

= ×

Diapositive 2Diapositive 2

3 de 21 s (21 s 7) 3

7 3 s 3 9 s

= ÷ ×

= ×=

Diapositive 2Diapositive 2

(60min 3) 2

20min 2

2 de

40mi

1 h3

n

= ÷ ×

= ×=

Diapositive 3Diapositive 3

20mi

2 de 1 h (60min

n 2

3

40mi

2

n

)3

==

×

×

= ÷

Diapositive 3Diapositive 3

2 de 1 h (60min 3) 2

3

20

min 2 40min

=

=

÷ ×

= ×

Diapositive 3Diapositive 3

2 de 1 h (60min 3) 2

3 20min 2 40min

= ÷ ×

= ×=

Diapositive 3Diapositive 3

(28min 4) 3

7min 3

3 de

21mi

28min4

n

÷ ×

= ×=

=

Diapositive 4Diapositive 4

7mi

3 de 28min (28

n 3 2

min 4) 3

m

4

1 in= ×=

= ÷ ×

Diapositive 4Diapositive 4

3 de 28min (28min 4) 3

4

7m

in 3 21min

= ÷

=

×

= ×

Diapositive 4Diapositive 4

3 de 28min (28min 4) 3

4 7min 3 21min

= ÷ ×

= ×=

Diapositive 4Diapositive 4

(15h 5) 4

3h 4

4

de 15

h5

2h

1

÷

×=

= ×

=

Diapositive 5Diapositive 5

3h 4 12

4 de 15 h (15h 5) 4

5

h

= ÷

= ×=

×

Diapositive 5Diapositive 5

4 de 15 h (15h 5) 4

5

3h 4 12h

= ÷

=

×

= ×

Diapositive 5Diapositive 5

4 de 15 h (15h 5) 4

5 3h 4 12h

= ÷ ×

= ×=

Diapositive 5Diapositive 5