Correction de l'exercice 3
Décompose
l’opération pour trouver le résultat :
Ex :
7 X 20 = 7
X 2
X 10 = 14
X
10 = 140
6
X 50 = 6 X 5 X 10 = 30 X 10 = 300
30 X 8 = 3 X 8 X 10 = 24 X 10 = 240
7 X 50 = 7 X 5 X 10 = 35 X 10 = 350
8 X 40 = 8 X 4 X 10 = 32 X 10 = 320
40 X 9 = 4 X 9 X 10 = 36 X 10 = 360
8 X 200 = 8 X 2 X 100 = 16 X 100 = 1600
300 X 5 = 3 X 5 X 100 = 15 X 100 = 1500
7 X 400 = 7 X 4 X 100 = 28 X 100 = 2800