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Techniques for adding the numbers 1 to 100

Posted 02.13.2007, under Math

There’s a popular story that Gauss, mathematician extrodanaire, had a lazy teacher. The “educator” wanted to keep the kids busy so he could take a nap — he asked the class to add the numbers 1 to 100 - no small feat when most kids are still learning how to carry.

Gauss walked up and showed the answer on his blackboard: …

The Rule of 72

Posted 01.25.2007, under Math

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