
Plus Advent Calendar Door #2: Shake to solve
Sometimes real progress in maths comes when you find a way of looking at a problem in two different ways. Here is a great example of this.

This puzzle is inspired by content on our sister site Wild Maths, which encourages students to explore maths beyond the classroom and is designed to nurture mathematical creativity. The site is aimed at 7 to 16 year-olds, but open to all. It provides games, investigations, stories and spaces to explore, where discoveries are to be made. Some have starting points, some a big question and others offer you a free space to investigate.
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Anonymous
I think this is how Gauss managed to sum the integers 1 to 100 in record time when he was a schoolboy as 1+2+....+100 is the same as 50*101.