Exercice 5:
712 =
700 + 10 + 2
400 + 40 + 2 =
442
179 =
200 + 50 + 9 =
957 =
500 + 40 + 3 =
789 =
200 + 90 + 1 =
814 =
800 + 40 + 8 =
