Ratio Problem-Solving Game | KS2–KS3 Maths | Defuse the Bomb Challenge + Answers

Add excitement to your ratio lessons with this high-engagement Defuse the Bomb – Ratio Challenge, perfect for KS2, KS3, GCSE Foundation recap, intervention groups or end-of-lesson problem-solving. Pupils must answer 10 ratio questions correctly to identify the order in which to cut the coloured wires on the illustrated bomb (page 1). Each colour corresponds to a number in the answer–wire table, and pupils follow their calculated answers to uncover the wire sequence needed to “defuse” the bomb.

This activity is ideal for maths mysteries, paired challenges, escape-room style lessons, starters or fun Friday tasks. It reinforces ratio fluency while promoting reasoning, accuracy and teamwork.

What’s Included

◆ Full “Defuse the Bomb” worksheet with bomb illustration and coloured wires
◆ 10 ratio word problems with mixed real-life contexts
◆ Answer–wire conversion table for solving the puzzle
◆ Complete answer sheet with correct wire order
◆ Print-friendly version for class use
◆ Ideal for KS2–KS3 ratio lessons, retrieval practice & problem-solving

Why Teachers Love It

✔ Makes ratio practice exciting and memorable
✔ Encourages reasoning and careful checking
✔ Suitable for mixed-ability classes
✔ Works brilliantly for group challenges or independent maths puzzles
✔ Zero prep—just print and go

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