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Calcul mentalCalcul mental
« Les aires »« Les aires »
Séquence n°5Séquence n°5
Calculer l'aire de
chaque figure.
n°1n°1
n°2n°2
n°3n°3
n°4n°4
n°5n°5
CorrectionCorrection
n°1n°1
n°1n°1
Aire = 9mm×3mm
n°1n°1
Aire = 9mm×3mm = 27mm
2
n°2n°2
n°2n°2
Aire = 8dm×8dm
n°2n°2
Aire = 8dm×8dm = 64dm
2
n°3n°3
n°3n°3
Aire =
5m×12m
2
n°3n°3
Aire =
5m×12m
2
=
60m2
2
n°3n°3
Aire =
5m×12m
2
=
60m2
2
= 30m2
n°3n°3
Aire =
5m×12m
2
=
60m2
2
= 30m2
Aire = 5m×
12m
2
n°3n°3
Aire =
5m×12m
2
=
60m2
2
= 30m2
Aire = 5m×
12m
2
= 5m×6m
n°3n°3
Aire =
5m×12m
2
=
60m2
2
= 30m2
Aire = 5m×
12m
2
= 5m×6m = 30m
2
n°4n°4
n°4n°4
Aire =
7cm×6cm
2
n°4n°4
Aire =
7cm×6cm
2
=
42cm
2
2
n°4n°4
Aire =
7cm×6cm
2
=
42cm
2
2
= 21cm2
n°4n°4
Aire =
7cm×6cm
2
=
42cm
2
2
= 21cm2
Aire = 7cm×
6cm
2
n°4n°4
Aire =
7cm×6cm
2
=
42cm
2
2
= 21cm2
Aire = 7cm×
6cm
2
= 7cm×3cm
n°4n°4
Aire =
7cm×6cm
2
=
42cm
2
2
= 21cm2
Aire = 7cm×
6cm
2
= 7cm×3cm = 21cm
2
n°5n°5
n°5n°5
Aire =
6dam×6dam
2
n°5n°5
Aire =
6dam×6dam
2
=
36dam
2
2
n°5n°5
Aire =
6dam×6dam
2
=
36dam
2
2
= 18dam
2
n°5n°5
Aire =
6dam×6dam
2
=
36dam
2
2
= 18dam
2
Aire = 6dam×
6 dam
2
n°5n°5
Aire =
6dam×6dam
2
=
36dam
2
2
= 18dam
2
Aire = 6dam×
6 dam
2
= 6dam×3dam
n°5n°5
Aire =
6dam×6dam
2
=
36dam
2
2
= 18dam
2
Aire = 6dam×
6 dam
2
= 6dam×3dam = 18dam2

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