Thursday, 27 September 2012

Super-fast addition

Ask the class for two numbers, for example 3 and 5, and use these to generate 10 terms of a Fibonacci-esque sequence:

3, 5, 8, 13, 21, 34, 55, 89, 144, 233

Ask someone to add these up with a calculator while you add them up in your head.

What is the quick way to do this?

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