Correction :

10 + 5 = 15	25 - 6 = 19
15 + 4 = 19	4 - 0 = 4
35 - 19 = 16	32 - 9 = 23
12 + 17 = 29	7 + 21 = 28
13 + 19 = 32	24 : 4 = 6
18 + 18 = 36	15 + 10 = 25
45 - 21 = 24	40 - 22 = 18
12 + 23 = 35	39 - 22 = 17
15 - 15 = 0	13 - 11 = 2
21 + 18 = 39	6 + 8 = 14