Calcul mental 20 secondes par calcul. 5 ème (-9) - (+4) = (-8) - (+2) = 1 er calcul :

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Presentation transcript:

Calcul mental 20 secondes par calcul. 5 ème

(-9) - (+4) = (-8) - (+2) = 1 er calcul :

(-3) - (-10) = (-8) - (-3) = 2 ème calcul :

(+9) - (+7) = (+11) - (+9) = 3 ème calcul :

(-6) - (+5) = (-9) - (+8) = 4 ème calcul :

(-12) - (+9) = (+17) - (-14) = 5 ème calcul :

(+20) - (+5) = (+30) - (+8) = 6 ème calcul :

(+16) - (-27) = (+15) - (-26) = 7 ème calcul :

(-7,5) - (+13) = (-8,5) - (+12) = 8 ème calcul :

(-1,4) - (+2,7) = (+1,9) - (-1,3) = 9 ème calcul :

(+1,31) - (-4,4) = (+1,35) - (-4,2) = 10 ème calcul :