This article for pupils and teachers looks at a number that even the great mathematician, Pythagoras, found terrifying.
Read all about Pythagoras' mathematical discoveries in this article written for students.
How many differently shaped rectangles can you build using these equilateral and isosceles triangles? Can you make a square?
The number 2.525252525252.... can be written as a fraction. What is the sum of the denominator and numerator?
Ranging from kindergarten mathematics to the fringe of research this informal article paints the big picture of number in a non technical way suitable for primary teachers and older students.