Nine squares with side lengths 1, 4, 7, 8, 9, 10, 14, 15, and 18 cm can be fitted together to form a rectangle. What are the dimensions of the rectangle?
These pictures show squares split into halves. Can you find other ways?
I'm thinking of a number. My number is both a multiple of 5 and a multiple of 6. What could my number be?
Can you match pairs of fractions, decimals and percentages, and beat your previous scores?
How many moves does it take to swap over some red and blue frogs? Do you have a method?
Imagine you have an unlimited number of four types of triangle. How many different tetrahedra can you make?
How many balls of modelling clay and how many straws does it take to make these skeleton shapes?
We start with one yellow cube and build around it to make a 3x3x3 cube with red cubes. Then we build around that red cube with blue cubes and so on. How many cubes of each colour have we used?
Can you make square numbers by adding two prime numbers together?
Here are four cubes joined together. How many other arrangements of four cubes can you find? Can you draw them on dotty paper?
