What is 1.61111111 as a fraction?

If that is a terminating decimal:

1.61111111 = 161111111/100000000 = 1 61111111/100000000

If that is a repeating decimal:

1.6111... = (16.111... - 1.6111...)/9

= 14.5/9

= 145/90

= 29/18

= 1 11/18