Beautiful Pattern In Times Table - Summing The Numbers

You probably had to memorize the times table to 10 in school. What is the sum of all the products? Try solving it in 30 seconds! Then watch the video to see the solution presented in two methods.

I came across this problem in Arthur Benjamin's new book "The Magic of Math: Solving for x and Figuring Out Why": http://amzn.to/1LBk0OE

Blog post (text/image version): http://wp.me/p6aMk-4my

Sum 1 to N historical fiction    • Gauss discovered this at a very young...  

Square ending in 5    • How to square numbers ending in 5  

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