Draw some angles inside a rectangle. What do you notice? Can you prove it?
Play the divisibility game to create numbers in which the first two digits make a number divisible by 2, the first three digits make a number divisible by 3...
Identical squares of side one unit contain some circles shaded blue. In which of the four examples is the shaded area greatest?
In how many ways can you arrange three dice side by side on a surface so that the sum of the numbers on each of the four faces (top, bottom, front and back) is equal?
My two digit number is special because adding the sum of its digits to the product of its digits gives me my original number. What could my number be?
It's easy to work out the areas of most squares that we meet, but what if they were tilted?
Draw some isosceles triangles with an area of $9$cm$^2$ and a vertex at (20,20). If all the vertices must have whole number coordinates, how many is it possible to draw?
