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What is an Algorithm? – Swap Puzzles Worksheets for KS2 Computing

Key Stage



Years 3-6


In this resource, pupils are tasked with solving a puzzle by coming up with an algorithm that their team can follow faster than anyone else.

This gives a way to introduce the idea of the solution to a problem being a set of instructions that allow others to ‘solve’ it with no understanding.

It also explores how different algorithms can solve the same problem but may not be equally good – some may be faster.

Children will learn about algorithms, computational thinking, testing and efficiency

Download includes

  • The Swap Puzzle activity sheet(PDF)
  • The Swap Puzzle (PowerPoint)
  • Computing Without Computers booklet (PDF)

You can also try this online swap puzzle Applet.

Teaching London Computing is a resource hub from CAS London and CS4FN. Download more Teaching London Computing resources here or on its website at

What is an Algorithm? – Swap Puzzles Worksheets for KS2 Computing

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