Correction :

36 - 14 = 22	38 - 16 = 22
3 + 5 = 8	48 : 8 = 6
15 + 21 = 36	13 + 15 = 28
10 + 12 = 22	11 + 19 = 30
9 : 3 = 3	54 : 9 = 6
33 - 21 = 12	24 + 16 = 40
9 - 3 = 6	20 + 7 = 27
5 + 23 = 28	1 + 1 = 2
22 - 9 = 13	28 - 9 = 19
4 : 1 = 4	27 - 9 = 18