OCR GCSE Computer Science – Hexadecimal Representation | Binary, Decimal & Secret Code Lesson

OCR GCSE Computer Science – Hexadecimal Representation (Full Lesson Pack)
(Also ideal for AQA and Edexcel Computer Science courses)

This complete, editable lesson introduces hexadecimal numbers and their use in computing.
Students learn to convert between binary, decimal, and hexadecimal, discover why hex is used, and even decode a secret message hidden in hexadecimal code.

Perfect for OCR J277 Unit 1.2 – Data Representation and the Memory and Storage topic.

Lesson objectives

Students will be able to:

Convert numbers between binary, decimal, and hexadecimal.

Explain why hexadecimal is used in computing systems (e.g., compact representation, debugging).

Recognise number ranges for binary (0–255) and hexadecimal (00–FF).

Decode and reveal a secret word or message written in hexadecimal values.

What’s included

Fully editable Word lesson file with structured tasks.

Conversion tables and guided practice activities.

Starter quiz using the Hexadecimal Bee Game (online link included).

Binary–Hex–Decimal worksheets for students to complete digitally or on paper.

Challenge task – decode a secret message using real hexadecimal bytes (4F 4F 41 54 45 50 53 54).

Built-in checkpoints (“Is it ok to move on?”) for self-assessment and pacing.

Why teachers love it

Reinforces prior knowledge of binary while introducing hexadecimal through hands-on learning.

Encourages pattern recognition and logic thinking — perfect for mixed-ability KS4 classes.

Fully editable and ready to drop into any OCR J277 scheme of work.

Fun, game-based introduction that builds real confidence with number bases.

File format

Editable .docx worksheet/lesson pack

Optional online activity links (Hexadecimal Bee Game)

Tags
OCR GCSE Computer Science, J277, Data Representation, Hexadecimal, Binary, Decimal, Number Systems, Base 16, Base 2, Memory and Storage, Secret Message, KS4 Computing, Computer Science Lesson, OCR Unit 1.2