Correction :

15 + 9 = 24	19 + 13 = 32
29 - 12 = 17	10 - 5 = 5
20 + 14 = 34	25 - 1 = 24
28 - 24 = 4	15 + 0 = 15
28 - 16 = 12	21 + 16 = 37
15 + 3 = 18	9 + 10 = 19
23 + 8 = 31	4 + 21 = 25
36 - 15 = 21	2 × 6 = 12
17 + 15 = 32	2 × 10 = 20
25 - 3 = 22	20 - 17 = 3