There are an estimated 1.618 million web sites dedicated to recreational mathematics. Many of them feature interesting and useful material, but there is mammoth duplication of content. I strongly desire not to contribute to the clutter, hoping to offer perspectives sufficiently unique that they will not be encountered elsewhere.
Doubtless these materials will interest only a small percentage of visitors. No advanced learning is required here, however; a reasonable awareness of high-school math is sufficient.
The articles in this section are designed to be assimilated in numeric sequence. Each page features ideas or methods previously introduced.
Black Box math challenge
square root iteration
pencil and paper