Correction :

36 - 18 = 18	6 + 8 = 14
4 : 2 = 2	24 + 7 = 31
3 + 13 = 16	8 + 23 = 31
4 × 9 = 36	31 - 21 = 10
17 - 11 = 6	4 × 11 = 44
22 + 1 = 23	1 + 5 = 6
23 - 22 = 1	36 : 6 = 6
18 - 15 = 3	6 - 2 = 4
11 - 3 = 8	20 : 2 = 10
18 - 9 = 9	4 + 6 = 10