Je dois connaître les compléments à 10 par coeur :

0 --> 10 (car 0 + 10 = 10)

1 --> 9 (car 1 + 9 = 10)

2 --> 8 (car 2 + 8 = 10)

3 --> 7 (car 3 + 7 = 10)

4 --> 6 (car 4 + 6 = 10)

5 --> 5 ( car 5 + 5 = 10)

6 --> 4 (car 6 + 4 = 10)

7 --> 3 (car 7 + 3 = 10)

8 --> 2 (car 8 + 2 = 10)

9 --> 1 (car 9 + 1 = 10)

10 --> 0 (car 1 0 + 0 = 10)