Answer 1

You can first take off the last digit with %10, then /= 10 the number, until only a digit left.

That way, you can get the edge tickets.

(Can you infer from this explanation how to do the final step?)

Answer 2

What do you have to do in order to make two digits become an actual multidigit number?

How can 1 and 2 become 12?

Look at the procedure I described. It is related to that.