Calcul mental - création de Valentin

valentin2.jpg
9 + 7 - 8 = 8

16 + 17 - = 16
33 + 22 - = 30
15 + 22 - = 24
18 + 22 - = 22
35 + - 13 = 35
+ 15 - 20 = 20
38 + 22 - = 22
45 + - 32 = 20
64 + 9 - = 50
29 + - 18 = 40