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A fully resourced, dyslexia-friendly KS3 Computer Science lesson introducing Subroutines (Sub…EndSub), branching with IF/ELSE, and creating a fully functional calculator program.
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Includes PowerPoint, worksheet, worked examples, and challenge tasks—using the FREE online Small Basic compiler to ensure zero installation issues.
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Designed with dyslexia-friendly formatting: pastel colour schemes, readable font style, reduced text density, and high-contrast code samples.
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Students learn:
- How subroutines work and why programmers use them
- How Sub and EndSub create reusable blocks of code
- How to call subroutines in the correct order of execution
- How IF/ELSE statements allow the program to choose different outcomes
- How to build structured programs like calculators and mini-games
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Practical coding tasks:
- Analyse example code to understand line order and execution flow
- Complete a partially written calculator by creating AddNumbers(), SubtractNumbers(), and MultiplyNumbers()
- Use IF/ELSE to decide which subroutine to run
- Integrate user input to customise calculations
- Extend the program with divide functionality and improved structure
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Challenge activities (highly motivating for KS3):
- Add subroutines that fetch Number1 and Number2 directly from the user
- Create a command-driven calculator where the user selects add/subtract/multiply/divide
- Wrap the entire calculator inside a WHILE loop so it repeats until the user types EXIT
- Build a maths game: user chooses a skill, random numbers are generated, and the game continues until the correct answer is given
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Assessment and evidence:
- Multiple screenshot prompts using the Windows Snipping Tool
- Written explanation boxes to ensure understanding of subroutines and branching
- Debugging and code-building tasks to demonstrate mastery
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Lesson objectives:
- Create and call subroutines confidently
- Use IF/ELSE to control program flow
- Develop a working calculator using structured programming
- Apply logic, random numbers, and loops to create simple games
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Ideal for KS3 Computing, coding clubs, enrichment, or as preparation for Python functions and selection.
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This lesson is classroom-ready, accessible, and designed to make students feel like real programmers.
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£2.50