Korean Numbers

Listen to the following audio clips.  

1 2 3 4
5 6 7 8
9 10 20 30
40 50 60 70
80 90 99    
2 7 4 6
8 9 1 5
3 10 80 34
18 25 41 77
12 66 16 73
78 67 99 52
86 46 91 55
33 50 22 68
64 88 11 29
85 76 48 70
91 57 44 87
37