# What's up with my calculator?

As I am wont to do, I got a new calculator the other day. Obviously it needed a few test calculations:

5 + 6 = 11
22 - 17 = 5
10 + 3 = 13
4 * 6 = 24


OK, so far so good. But there were also a bunch of weird results that I don't understand:

2 * 1 = 10
9 + 7 = 9
3 - 1 = 3
34 - 8 = 2


What's going on?