Sequence 7 — Data Representation

Binary, binary arithmetic, hexadecimal, character representation, images, sound, compression and storage calculations. AQA 4.5, Lessons 36–45.

Binary Number System

  • Explain why computers use binary
  • Convert accurately between binary and denary
Lesson ready

Binary Arithmetic

  • Perform binary addition and subtraction
  • Recognise overflow
Lesson ready

Hexadecimal Number System

  • Explain the purpose of hexadecimal
  • Convert between hexadecimal, binary and denary
Lesson ready

Character Representation

  • Distinguish between ASCII and Unicode
  • Explain why Unicode was developed
Lesson ready

Image Representation

  • Explain how bitmap images are stored
  • Calculate image file sizes
Lesson ready

Sound Representation

  • Explain how sound is digitised
  • Calculate audio storage requirements
Lesson ready

Data Compression

  • Distinguish between lossless and lossy compression
  • Recommend suitable compression techniques
Lesson ready

Data Storage Calculations

  • Convert between storage units
  • Calculate file sizes
Lesson ready