## Month in Review – May 2012

Good day to all! In case you missed anything this month, here are the complete list of posts for May 2012.

In case you have not visited my other blogs yet, you may want to check them out.

1. Mathematical Palette – a blog about mathematical arts, beauty, wonders, and appreciation.
2. GeoGebra Applet Central – a collection of free and downloadable GeoGebra applets.
3. School of Freebies – a blog about free software and other freebies on the net.

## 39 Gorgeous Data Visualization Software

I learned recently from Math 2.0 about DataVisualization.CH, a site that creates as well as collects software and applications for data visualization and infographics.   The software on the site are categorized into three: maps, charts, and data.

Mathematics teachers should definitely check out the list. Some (or most?) of the software and apps are for free.

## Proof of the Sum of Square Numbers

In the first part of this series, we have counted  the number of squares on a chessboard, and we have discovered that it is equal to the sum of the squares of the first 8 positive integers. The numbers $1^2$, $2^2$, $3^2$ and so on are called  square numbers.

This method can be generalized to compute for the number of squares on larger square boards. If the measure of a board is $n \times n$, then the number of squares on it is » Read more

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