REPONSE EXERCICE N°5 ETAPE 8




Exercice n°5

8 x 25 = 2 x 4 x 5 x 5 = 4 x 5 x 2 x 5 = 4 x 5 x 10 = 200
15 x 12 = 3 x 5 x 2 x 6 = 3 x 6 x 2 x 5 = 3 x 6 x 10 = 180
25 x 22 = 5 x 5 x 2 x 11 = 5 x 2 x 5 x 11 = 10 x 55 = 550
18 x 5 = 2 x 9 x 5 = 10 x 9 = 90
16 x 35 = 2 x 8 x 7 x 5 = 10 x 56 = 560
24 x 45 = 2 x 2 x 6 x 5 x 9 = 10 x 2 x 6 x 9 = 2 x 10 x 54 = 2 x 540 =1 080