Yes, the chances of at least a 1 appearing on the roll of two dice is 11/36.

These calculations are easier to work out by finding the chance of it not happening, i.e.

The chance of the first die not being a 1, is 5/6

The chance of the second die not being a 1, is also 5/6

Multiply them together and the chance of not seeing a 1 on either dice becomes 25/36.

Therefore the remainder, 11/36, must be the chance of a 1 coming up at least once.

Nick