What you'll learn
How computers represent data in binary.
Key ideas
- A bit is one binary digit; 8 bits = 1 byte.
- Converting binary, decimal and hexadecimal.
- ASCII/Unicode for characters; pixels and colour depth for images.
Exam tips
- Practise conversions and show working.
- Explain colour depth in bits per pixel.
Common mistakes
- Miscounting binary place values.
- Confusing bits and bytes.