Have you ever wondered why a computer can only understand binary code ... numbers and letters using only two digits: 0 and 1. Each digit in binary code is called a bit, and eight bits make up a byte.

Note that binary numbers are usually written in blocks of four, separated by a space (eg 0111 1011). In denary, numbers are often written in blocks of three (eg 6 428 721). A quick way to check ...

Convert each denary digit into binary, making sure you write four digits for each value. Combine all four digits to make one binary number. Split a four-digit hexadecimal number into the separate ...