A Conversation for Pi
A quick and dirty approximation
Gordon, Ringer of Bells, Keeper of Postal Codes and Maps No One Can Re-fold Properly Started conversation Aug 10, 2002
If you need to very quickly calculate pi to a few decimal places, you can use 22/7 to two significant decimal places. 
A quick and dirty approximation
Sir Doug Posted Aug 29, 2002
Another fine approximation can be obtain by taking the first three odd digits and doubling them, like so:
1 1 3 3 5 5
Then, put the last three over the first:
355 / 113
This gives 3.14159..., six accurate decimals of pi.
A quick and dirty approximation
Uncle Ghengis Posted Sep 12, 2002
I always use the mnemonic "how I wish I could remember pi" - counting the number of digits in each word gives: "3 1 4 1 5 8 2".
A quick and dirty approximation
Uncle Ghengis Posted Nov 12, 2002
Ah yes. Lets say "characters", then shall we?
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A quick and dirty approximation
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