Calcul mental
N°26
“Des proportions ”
Calculer lesCalculer les
trois quartstrois quarts
de 20.de 20.
Diapositive 1Diapositive 1
4-Cm26 15-16
CalculerCalculer
5% de 40.5% de 40.
Diapositive 2Diapositive 2
4-Cm26 15-16
Compléter :Compléter :
Diapositive 3Diapositive 3
=
3
...%
25
4-Cm26 15-16
Compléter :Compléter :
Diapositive 4Diapositive 4
=
5 10
12 ...
4-Cm26 15-16
Compléter :Compléter :
Diapositive 5Diapositive 5
=
20 ...
4 3
4-Cm26 15-16
FIN
CORRECTION
Diapositive 1Diapositive 1
× = × =
3
20 3 5
4
15
Diapositive 2Diapositive 2
× = × = =
5 200
5% 40 40
100 100
2
Diapositive 3Diapositive 3
×
=
×
= =
3 3 4
25 25 4
12
100
12%
Diapositive 4Diapositive 4
=
5 10
12 24
Diapositive 5Diapositive 5
= =
20
5
4
15
3

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