
KS3 Computer Science – Variables, Concatenation & Arithmetic in Small Basic (2026 Updated) | FREE Online Compiler | Dyslexia-Friendly
A fully resourced, dyslexia-friendly KS3 Computer Science lesson introducing variables, concatenation and arithmetic operations using the FREE online Small Basic compiler.
Includes a complete PowerPoint, structured worksheet, worked examples and challenge tasks — ideal for specialists, non-specialists, cover lessons and coding clubs. Designed with dyslexia-friendly formatting: pastel backgrounds, clean layout, accessible fonts and high-contrast code examples.
Students learn:
- What a variable is and why programming relies on variables
- How to store and manipulate values in Small Basic
- The difference between concatenation (joining text) and arithmetic operations (calculating with numbers)
- How to create and apply formulas to solve problems in code
Hands-on programming tasks:
- Copy and run a starter program in the FREE online Small Basic editor
- Identify and explain operations used in the code
- Use variables to construct simple mathematical formulas
- Write a program to calculate the area of a triangle using Base × Height ÷ 2
- Transfer calculated results into a structured table to build computational thinking
- Apply the same logic to squares, rectangles, circles and even a 3D shape
Built-in assessment and evidence:
- Screenshot prompts for working programs
- Short written explanations to check understanding of variables and operators
- Challenge task encouraging independent problem-solving and creativity
Lesson objectives:
- Define and use variables confidently
- Explain the difference between concatenation and arithmetic
- Write and apply formulas to solve real mathematical problems in code
Perfect for:
- KS3 Computing
- Coding clubs and enrichment
- Cover lessons
- Preparation for Python variables, input/output and numeric operations
A polished, classroom-ready lesson that makes learning variables engaging, accessible and confidence-building for every learner.
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