The clues for this Sudoku are the product of the numbers in adjacent squares.
Can you find and prove the relationship between the area of a trapezium and the area of a triangle constructed within it?
Can you make sense of these three proofs of Pythagoras' Theorem?
The items in the shopping basket add and multiply to give the same amount. What could their prices be?
Some puzzles requiring no knowledge of knot theory, just a careful inspection of the patterns. A glimpse of the classification of knots and a little about prime knots, crossing numbers and knot arithmetic.
In 15 years' time my age will be the square of my age 15 years ago. Can you work out my age, and when I had other special birthdays?
Which of these games would you play to give yourself the best possible chance of winning a prize?
This shape comprises four semi-circles. What is the relationship between the area of the shaded region and the area of the circle on AB as diameter?
