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[quote=Nordo]...but it had all these nifty ways of doing large heavy calculations in your head. I couldn't see how I could impress girls with it so I lost interest.
quote]
Reminds me about Nikola Tesla - when he was 12 or so, his maths teacher (who hadn't prepared the lesson) told the class to work out the answer of 1+2+3+4+....+100, thinking it would take them an hour or so.
It took Tesla about 30 seconds - and he did it in his head.
0+100 = 100
1+99=100
2+98=100
...
...
...
49+51=100
so there are 50 pairs of X+Y = 100, so that equals 5000. And then there is 50 left over, so the total is 5050!
Easy!
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