It can be useful to convert hex to dec sometimes without opening up a tool or
website all the time. Here's some practice material for working with hexadecimals:

Lesson 1 - What's 'c' in decimal?
Lesson 2 - That annoying table of 16.
Lesson 3 - Reverse of lesson 2.
Lesson 4 - Basic arithmetic.
Lesson 5 - Full conversion
Bonus lesson - dream in hex
Toggle log
Cheat - If you don't know an answer