Each of the main diagonals of this sudoku must contain the numbers 1 to 9 and each rectangle width the numbers 1 to 4.

Build gnomons that are related to the Fibonacci sequence and try to explain why this is possible.

These gnomons appear to have more than a passing connection with the Fibonacci sequence. This problem ask you to investigate some of these connections.

I took the graph y=4x+7 and performed four transformations. Can you find the order in which I could have carried out the transformations?

Can you work out the means of these distributions using numerical methods?

Get into the exponential distribution through an exploration of its pdf.

How is the length of time between the birth of an animal and the birth of its great great ... great grandparent distributed?

James and Dylan showed clear mathematical thinking to prove this result about quadrilaterals.

A personal investigation of Conway's Rational Tangles. What were the interesting questions that needed to be asked, and where did they lead?

We asked what was the most interesting fact that you can find out about the number 2009. See the solutions that were submitted.

This is the second article in a two part series on the history of Algebra from about 2000 BCE to about 1000 CE.