Correction :

36 - 17 = 19	4 + 3 = 7
12 - 0 = 12	37 - 13 = 24
4 + 23 = 27	9 + 21 = 30
32 - 14 = 18	21 - 7 = 14
20 - 2 = 18	7 + 3 = 10
6 : 6 = 1	10 - 7 = 3
21 - 16 = 5	16 - 0 = 16
16 : 8 = 2	12 : 6 = 2
4 × 10 = 40	20 - 9 = 11
18 + 3 = 21	17 - 12 = 5