Correction :

45 : 5 = 9	3 - 0 = 3
21 - 10 = 11	17 - 10 = 7
5 + 17 = 22	40 - 23 = 17
9 × 7 = 63	63 : 7 = 9
10 : 10 = 1	15 + 6 = 21
32 - 13 = 19	17 + 13 = 30
6 × 6 = 36	27 - 13 = 14
12 + 18 = 30	12 + 24 = 36
8 - 4 = 4	0 + 4 = 4
6 + 24 = 30	16 + 9 = 25