Puzzle 1 of 14
- Rectangle Perimeter Brain Teaser: not done yet
- Two-Digit Number Brain Teaser: not done yet
- The Word That's Always Spelled Wrong: not done yet
- The Cracked Bottle Brain Teaser: not done yet
- The Farmyard Legs Brain Teaser: not done yet
- The Page Numbers Brain Teaser: not done yet
- The Marble Ratio Brain Teaser: not done yet
- The Polygon Angle Brain Teaser: not done yet
- The Sock Drawer Probability Brain Teaser: not done yet
- The Consecutive Even Numbers Brain Teaser: not done yet
- The Shrinking Word Brain Teaser: not done yet
- The Let's Eat Grandma Brain Teaser: not done yet
- The Cold Metal Spoon Brain Teaser: not done yet
- The Browning Apple Brain Teaser: not done yet
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Rectangle Perimeter Brain Teaser
A rectangle has a perimeter of 36cm. Its length is twice its width. What are the rectangle's dimensions?
Rectangle Perimeter Brain Teaser
A short algebra puzzle: find a rectangle's dimensions from its perimeter and a ratio.
Perimeter and simple algebra · KS3
Two-Digit Number Brain Teaser
A number-properties puzzle combining divisibility, digit sums and a range.
Number properties and divisibility · KS2-KS3
The Word That's Always Spelled Wrong
A classic self-referential wordplay riddle about English spelling.
Wordplay · KS2+
The Cracked Bottle Brain Teaser
A science reasoning puzzle about why a sealed water bottle cracks in the freezer.
States of matter · KS3
The Farmyard Legs Brain Teaser
Count the heads, count the legs, then work out how many cows are hiding in the farmyard.
Problem solving with number · KS2
The Page Numbers Brain Teaser
A printer uses 192 digits to number every page of a book. How many pages does the book have?
Place value and counting · KS2-KS3
The Marble Ratio Brain Teaser
A bag of red and blue marbles changes ratio when 10 red marbles are added. How many marbles were there to start with?
Ratio and proportion · KS3
The Polygon Angle Brain Teaser
Every interior angle of a regular polygon is 156°. How many sides does it have?
Angles in polygons · KS3-GCSE
The Sock Drawer Probability Brain Teaser
Two socks are pulled from a drawer of 10. Use the chance of a red pair to work out how many red socks there are.
Probability without replacement · GCSE
The Consecutive Even Numbers Brain Teaser
Two consecutive even numbers multiply to make 288. What are they?
Forming and solving quadratics · GCSE
The Shrinking Word Brain Teaser
Which word becomes shorter when you add two letters to it? A classic wordplay riddle.
Wordplay · KS2+
The Let's Eat Grandma Brain Teaser
One missing punctuation mark turns a family dinner invitation into something much more alarming. Which mark saves Grandma?
Punctuation · KS2-KS3
The Cold Metal Spoon Brain Teaser
A metal spoon and a wooden spoon have sat in the same room all day, yet the metal one feels colder. Why?
Thermal conduction · KS3
The Browning Apple Brain Teaser
Cut an apple in half and leave it on the side. Within an hour the white flesh turns brown. What is happening?
Chemical reactions · KS3
How difficult are these puzzles?
Each puzzle states roughly which age group it suits, from KS2 upwards, but none require exam-board-specific knowledge - just the reasoning skill each one is built around.
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