Correction :

37 - 24 = 13	18 : 2 = 9
8 - 5 = 3	22 + 22 = 44
3 × 5 = 15	16 - 7 = 9
3 + 1 = 4	11 - 7 = 4
25 : 5 = 5	4 : 1 = 4
17 + 21 = 38	12 - 12 = 0
17 - 1 = 16	34 - 13 = 21
36 - 16 = 20	77 : 11 = 7
13 + 8 = 21	26 - 19 = 7
8 + 22 = 30	2 + 15 = 17