Trouve les nombres manquants :

12 + 8 = .....11 - 6 = .....
5 + ..... = 15..... + 3 = 23
35 - 16 = .......... × 6 = 6
23 - 5 = .....3 × ..... = 18
39 - 23 = .....19 + ..... = 20
..... + 22 = 4122 - ..... = 15
10 : 1 = .....23 + 4 = .....
24 - 24 = .......... + 6 = 22
..... - 8 = 7..... + 3 = 20
..... - 2 = 20..... + 0 = 4