Correction :

22 + 23 = 45	24 - 24 = 0
6 + 5 = 11	11 + 0 = 11
5 × 6 = 30	28 - 7 = 21
26 - 23 = 3	3 + 6 = 9
3 + 1 = 4	23 - 23 = 0
0 + 21 = 21	16 + 21 = 37
16 - 1 = 15	14 - 0 = 14
7 - 7 = 0	0 + 19 = 19
20 - 19 = 1	0 + 1 = 1
18 - 10 = 8	7 + 17 = 24