Correction :

16 + 6 = 22	33 - 20 = 13
23 + 0 = 23	36 - 20 = 16
99 : 9 = 11	30 - 6 = 24
34 - 11 = 23	22 - 10 = 12
24 - 9 = 15	21 + 6 = 27
6 × 1 = 6	38 - 19 = 19
17 - 6 = 11	37 - 18 = 19
14 - 8 = 6	12 + 3 = 15
56 : 7 = 8	20 + 23 = 43
10 + 23 = 33	39 - 19 = 20