Correction :

6 × 11 = 66	14 + 1 = 15
7 × 11 = 77	16 + 3 = 19
2 - 0 = 2	4 × 8 = 32
11 × 10 = 110	9 × 2 = 18
24 + 19 = 43	16 + 12 = 28
23 + 18 = 41	13 - 4 = 9
30 - 23 = 7	13 + 8 = 21
20 + 5 = 25	19 - 19 = 0
13 + 11 = 24	32 - 24 = 8
13 + 10 = 23	24 + 21 = 45