Hexadecimal silly. Or octal?
Hex is shorthand for binary..
Now that's funny. I remember teaching alternative number systems to my kids. It's not really hard. Best way is to start with a clock. Time is actually more complex than a lot of folks really thing You're looking at at least three separate bases. Depending upon whether or not you're using military time, whether or not you care about am/pm indicators it can be more.
Well done.