Multiplicar per 9 i per 11
11 x 11 = 
15 x 11 = 
11 x 31 = 
11 x 16 = 
11 x 20 = 
25 x 11 = 
65 x 11 = 
12 x 9 = 
25 x 9 = 
16 x 9 = 
13 x 9 = 
34 x 9 = 
30 x 9 = 
9 x 18 = 
54 x 11 = 
22 x 11 = 
78 x 9 = 
82 x 9 = 
26 x 9 = 
32 x 11 = 
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