Ohh My God but I would tell you something very simple method which would be good for learning as well.

For multiplication of 11 use the following technique

123 x 11
Consider the number as 01230
And answer would be
Code:
0+1 | 1+2 | 2+3 | 3+0
 1  |  3  |  5  | 3
How we get this

123
x11
===
0123
123x
===
1353

So applying same on the number

012345678901234567890123456789012
12345678901234567890123456789012x
==========================
135802467913580246791358024679132

Congrats hotnspicy