Correction :

11 + 14 = 253 + 20 = 23
11 + 21 = 3224 - 22 = 2
2 + 20 = 2214 + 3 = 17
35 - 22 = 1317 - 12 = 5
9 × 2 = 186 × 9 = 54
30 - 8 = 2217 + 15 = 32
7 × 9 = 6319 - 2 = 17
19 - 0 = 1922 - 4 = 18
6 + 6 = 1220 - 1 = 19
18 + 24 = 4219 - 9 = 10