Fifths: Binary and Hexadecimal numbers
What you need to know:
How binary numbers work. How to convert from Denary to Binary and Binary to Denary. What a byte is and how it is used to measure memory size. How to represent binary numbers in Hexadecimal and convert back and forward to both binary and denary.
How binary numbers work. How to convert from Denary to Binary and Binary to Denary. What a byte is and how it is used to measure memory size. How to represent binary numbers in Hexadecimal and convert back and forward to both binary and denary.
What are binary numbers and how do they work?  HowStuffWorks
Using hexadecimal numbers Binary  Decimal  Hexadecimal converter How binary and hexadecimal numbers are used How bytes are used to measure storage Cisco Binary Game 
