A revision-guide and workbook that explores everything you'll ever need to know about binary and hexadecimal number systems for the GCSE in Computing or Computer Science. In this innovative edition each example and question has an online video component that clearly explains how to complete the exercises. Covers the following topics: What is a Number System? Converting from Binary to Denary Converting from Denary to Binary Binary Addition Binary Subtraction Converting from Hexadecimal to Denary Converting from Denary to Hexadecimal Converting from Binary to Hexadecimal Converting from Hexadecimal to Binary Bitwise Manipulation Including: Worked Examples Plenty of Questions for you to practice Flow charts of the techniques QR code links to videos of worked examples