Correction :

9 + 22 = 31	13 + 21 = 34
1 + 19 = 20	24 + 9 = 33
45 - 22 = 23	42 - 21 = 21
7 - 5 = 2	46 - 23 = 23
11 + 16 = 27	15 + 7 = 22
38 - 20 = 18	8 × 6 = 48
121 : 11 = 11	23 - 7 = 16
16 + 20 = 36	11 + 16 = 27
13 - 6 = 7	5 - 3 = 2
3 × 11 = 33	19 + 11 = 30