Correction :

46 - 24 = 22	20 + 20 = 40
20 - 17 = 3	37 - 21 = 16
11 : 11 = 1	26 - 5 = 21
55 : 11 = 5	8 + 2 = 10
37 - 20 = 17	20 + 7 = 27
14 + 13 = 27	22 + 18 = 40
23 - 11 = 12	6 × 10 = 60
5 + 18 = 23	15 + 9 = 24
10 + 18 = 28	11 + 18 = 29
30 - 12 = 18	27 - 19 = 8