Quick Reference - Number Systems
This key facts covers Quick Reference - Number Systems within Binary & Hex for GCSE Computer Science. Revise Binary & Hex in 3.3 Data Representation for GCSE Computer Science with 16 exam-style questions and 22 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 14 of 15 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 14 of 15
Practice
16 questions
Recall
22 flashcards
Quick Reference - Number Systems
Conversion Cheat Sheet:
| Denary | Binary (8-bit) | Hexadecimal |
|---|---|---|
| 0 | 00000000 | 00 |
| 10 | 00001010 | 0A |
| 16 | 00010000 | 10 |
| 31 | 00011111 | 1F |
| 100 | 01100100 | 64 |
| 128 | 10000000 | 80 |
| 200 | 11001000 | C8 |
| 255 | 11111111 | FF |
Common Uses in Computing:
- Binary: All computer storage and processing (machine code, RAM, files)
- Hex: Memory addresses (0x1A2F), colors (#FF5733), MAC addresses, error codes, assembly language
- Denary: User interfaces, calculations we see on screen
Keep building this topic
Read this section alongside the surrounding pages in Binary & Hex. That gives you the full topic sequence instead of a single isolated revision point.
Practice Questions for Binary & Hex
Which of the following correctly describes the hexadecimal number system?
Explain why hexadecimal is used instead of binary when programmers write memory addresses and colour codes. Give three reasons.
Quick Recall Flashcards
16 questions on Binary & Hex — practise free
Instant marking, adaptive difficulty, and 22 spaced repetition flashcards. Free until your GCSEs.
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