How many digits of Pi can you recite off of the top of your head? (name them e.g. 3.14159265358979…….)

Question: How many digits of Pi can you recite off of the top of your head? (name them e.g. 3.14159265358979.......)
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Asked by BeenP on 9 Nov 2020.
- Sarah Brown answered on 9 Nov 2020:
  
  I can only recite the first 7 digits (though it used to be more). How many can you recite? Bet it is more than me 😛
- Eduard Campillo-Funollet answered on 9 Nov 2020:
  
  Eight… and I know that is not much!
  
  But I have never been good and memorising stuff, this is one of the things I like about maths: many times you can understand maths much better than just memorising!
  For instance, I don’t know many digits of Pi but I understand how they are computed. The current “record” is 50,000,000,000,000 digits and it took a supercomputer over 300 days!
- Chris Budd answered on 9 Nov 2020:
  
  3.141592653589793 …
  
  And yes .. I DO need to know all of these digits for my work.
  
  pi is very very important in communication, WiFi and in GPS .. both areas that I work in.
  Even a small error in pi gets multiplied up quickly to be a large error in the solution.
  So I need to know a lot of digits to make sure that the calculations work out.
  
  If you want a pretty accurate value for Pi (to 6 DP) then just remember 1 3 5
  then
  
  Pi approx 355/113
  
  Or if you prefer .. in my opinion the best formula in the whole of maths is:
  
  pi/4 = 1 – 1/3 + 1/5 – 1/7 + 1/9 – 1/11 + 1/13 – 1/15 + …
  
  Isnt that lovely!!!
- Tom Ranner answered on 9 Nov 2020:
  
  I know 3.14159 – I’m luck to get to use a computer all day long if I need to know any more than that!
- Chris Tognini answered on 9 Nov 2020:
  
  3.14159265359… although I did round up the last digit 🙂
- Alan Walker answered on 9 Nov 2020:
  
  Three. I’ve a truly shocking memory (one of the reasons I studied mathematics rather than a subject where memory is important). Knowing an approximation for pi isn’t important for the work I do, so I’ve never sat down to try to learn more.
  
  However, I’ve a friend who used a 20-word rhyme to learn the first 20 digits. Naturally, I can’t remember it!
- Christos Klerides answered on 9 Nov 2020:
  
  Not many! 3.14159. More important understanding the calculations in the background than memorising numbers by heart!
- Sophie Carr answered on 9 Nov 2020:
  
  A lot less that you write here! I can remember 3.142 and then I’d have to look them up.
- Cesare Giulio Ardito answered on 10 Nov 2020:
  
  Not many (and I barely know the third digit of e!), but in today’s world it just means that the few times I need to know more digits than just “3.14” I waste two seconds typing “pi” into Google, or my calculator.
  
  Better be memory-efficient and remember other, less findable things!
- Nathan Turner answered on 11 Nov 2020:
  
  I only remember 3.1415 (which is enough for me!) however if I wanted to find more digits I could use one of my favourite formulae:
  
  pi^2 / 6 = 1 + 1/2^2 + 1/3^2 + 1/4^2 + 1/5^2 + …
- Thomas Woolley answered on 11 Nov 2020:
  
  3.14159265
  
  There is a certain rhythm to these ones that I can chant to myself.
- Kate Elliott answered on 16 Nov 2020:
  
  3.142 if I need more than that I use a pi function on my calculator!

Question: How many digits of Pi can you recite off of the top of your head? (name them e.g. 3.14159265358979.......)

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