Correction :

30 - 24 = 6	20 : 10 = 2
11 - 2 = 9	7 + 11 = 18
22 - 4 = 18	6 + 17 = 23
22 - 2 = 20	56 : 8 = 7
2 + 9 = 11	0 + 4 = 4
11 × 1 = 11	12 + 13 = 25
30 - 9 = 21	19 - 5 = 14
4 × 11 = 44	29 - 5 = 24
21 + 12 = 33	29 - 16 = 13
12 + 23 = 35	4 × 3 = 12