Question 828920
The trick is to see what the terms have in common.  In this case, it's multiplication.  We can see from the first set that 1x1=1.  Aha!  What is 11x11?  Yes, 121.  If you use your calculator, you can see that each subsequent set is multiplied.
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Your next one is 11111.1111 (or 11111*11111) = 123454321 
The next one after that is 111111.111111 (or 111111*111111) = 12345654321
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Can you do the next one WITHOUT a calculator?  Look at the pattern of each number (hint: middle number)
1111111.1111111 = ?