KS3/GCSE Pseudocode "Predict the Output" Worksheets (Tracing Algorithms)

Master the skill of tracing algorithms with this “print-and-go” Pseudocode Prediction Pack.

Tracing code to predict the output is one of the most common—and most difficult—questions in GCSE Computer Science exams. This pack is designed to build student confidence in following logic flow, variable updates, and data manipulation without the distraction of Python syntax errors.

Designed for KS3 students moving into text-based coding and GCSE students (OCR J277 / AQA 8525) revising for Paper 2.

What’s Included?
You will receive a high-quality, printable PDF containing 8 visual logic challenges spread across 2 worksheets.

Each page follows a structured “4-Box” layout to maximize practice time:

• 4 x Numeric Logic Puzzles: Testing mathematical operations, loops (For/While), and variable updates.
• 2 x Character Puzzles: Testing selection (If/Else) and single-char comparisons.
• 2 x String Manipulation Puzzles: Testing concatenation, casting, and string appending.

Perfect for:
-Starter Activities (Bell work)
-Plenary/Exit Tickets to check understanding
-Homework tasks
-“Unplugged” lessons when computers are unavailable

Answer Key Included