Correction :

1 + 13 = 14	35 : 7 = 5
34 - 12 = 22	2 + 12 = 14
13 - 4 = 9	3 + 1 = 4
18 + 5 = 23	22 + 24 = 46
22 - 3 = 19	30 - 21 = 9
13 - 12 = 1	3 - 0 = 3
9 + 21 = 30	6 + 14 = 20
27 - 11 = 16	1 + 15 = 16
30 - 19 = 11	2 + 1 = 3
14 + 19 = 33	16 + 11 = 27