Correction :

19 - 3 = 16	11 - 5 = 6
34 - 15 = 19	16 - 2 = 14
36 - 12 = 24	12 : 4 = 3
22 + 8 = 30	121 : 11 = 11
5 + 22 = 27	8 × 10 = 80
25 - 7 = 18	20 - 20 = 0
11 + 23 = 34	54 : 9 = 6
3 + 7 = 10	24 : 3 = 8
46 - 24 = 22	36 - 18 = 18
23 - 0 = 23	3 + 15 = 18