Calcul mental 20 secondes par calcul. 5èmes (-5) + (+2) = (-11) + (+7) = 1 er calcul :

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Presentation transcript:

Calcul mental 20 secondes par calcul. 5èmes

(-5) + (+2) = (-11) + (+7) = 1 er calcul :

(-15) + (-19) = (-18) + (-16) = 2 ème calcul :

(+29) + (+7) = (+5) + (+29) = 3 ème calcul :

(-7) + (+7) = (-2) + (+2) = 4 ème calcul :

(-11) + (+5) = (+15) + (-9) = 5 ème calcul :

(+21) + (+7) = (+31) + (+7) = 6 ème calcul :

(+13) + (-28) = (+11) + (-29) = 7 ème calcul :

(-6,6) + (+12) = (-5,6) + (+15) = 8 ème calcul :

(-1,8) + (+2,7) = (+1,8) + (-2,7) = 9 ème calcul :

(+1,04) + (-5,4) = (+1,03) + (-5,8) = 10 ème calcul :