# How many decimals of Pi do you remember?

#### pi-70679

How many decimals of Pi do you people remember by heart. I started learning them not so long ago and so far i got:
3.14159 26535 89793 23846 26433 83279 50288 41971 69399 37510
58209 74944 59230 78164 06286 20899 86280 34825 34211 70679
82148 08651 32823 06647 09384 46095 50582 23172 53594 08128
which is exactly 150 (without cheating). I try to learn 5-10 more each day.

Related General Discussion News on Phys.org

#### zk4586

2 decimals. 3.14. Not that memorizing pie out to all those decimal places is pointless, but...well, yeah, it's pointless.

Last edited:

#### pi-70679

I gotta admit, it's probably one of the less useful things i ever did in my life, but heh, i had to come up with something to do in non-physics or math classes...

#### Andy

Oh my god! why? if you ever need to use pie why dont you just use the pie button on your calculator, far simplar.

#### climbhi

Dude, andy, pi buttons on calculators don't go to 150 digits...

I'm with zk4586 on this one. I think once I may have known it to five digits but that was long ago.

#### pi-70679

I just find that learning pi is a good way to maintain your memory active, plus it's a really good time waster. I found out that now i can remember series of numbers in a lot less time. I just use birthdates, repeating numbers, and my latest, pattern you do with your fingers when you type the keys on the numpad.

#### Bunting

i took the liberty of stealing the text file of 100 000 dp of pi and pasted it all over my own website :P

http://www.sweeto.co.uk/Stuff/Pi.php?page=Pi [Broken]

personally i can only rememeber 3.141592653 :P

Last edited by a moderator:

Originally posted by pi-70679
I just find that learning pi is a good way to maintain your memory active, plus it's a really good time waster.
Yes, it sounds pretty sweet and you have certainly memorized an impressive string of digits too. How about something for the coordination of the body such as juggling? If you are standing around almost anywhere with time on your hands you can usually find a few rocks and have at it…

#### pi-70679

as nice as this sounds, i doubt my teachers would appreciate.

#### climbhi

Originally posted by pi-70679
as nice as this sounds, i doubt my teachers would appreciate.
they probably don't appreciate you memorizing pi in their class either so why not go the full distance and start juggling. In fact why don't you start out with chainsaws or flaming torches for that matter, I'm sure the teachers will love that, it would probably bring a lot of intelectual input to the class...

#### pi-70679

Just so you know, i practice shooting for hand eye coordination. Sniping (although it has a bad reputation), is the best exercise i know to learn how to totally control how your muscles react and is quite good for coordination of body-eye coordination. I've been introduced to that sport by a friend in the army, and i just love it.

#### Artman

What's Pi? I usually just round up at 3.142.

Originally posted by pi-70679...
Sniping (although it has a bad reputation), is the best exercise i know to learn how to totally control how your muscles react and is quite good for coordination of body-eye coordination.
When you put this statement together with your memorizing Pi to 150 decimal places, we can only hope that you live in a trailer because they don't have basements to hide victims bodies. Just kidding, (I hope)

#### Alex00

Hi

If caculators don't go up to 150 digits then you can't use 150 digits of PI when using a caculator and you would need a caculator to work out the result of any sum involving pi at 150 digits

#### pi-70679

Artman: True it may seem weird when you read those statements one after the other. If only considering those two statements, i would in fact seem like a complete maniac... Which i can reassure you i am not: i use an air rifle, which means that i have no clue about how to handle a rifle with recoil and i am thus completely harmless. lol, i'll be more careful next time and try to express myself clearer so i don't look like a psycho.

Alex00: I never use that many decimal places for calculations, if you know about significant figures then you know it would be completely useless anyways. It's just for the fun of it.

hi

fun, in maths?

#### Andy

So very very sad, how can you have fun in a maths lesson the only reason its like at my college is because the maths teacher is very sexy and all the blokes want to give her one but thats a different topic all together, the only good thing about maths is its very useful whilst studying physics, at least alex00 agress with me.

#### enigma

Staff Emeritus
Gold Member
3.1415926

How many do I use if I'm not using a calculator?

3

If I'm reeeeallly picky, I just round up the answer a bit to deal with the .14.

Otherwise, it's kinda pointless to do it in your head, so why bother memorizing?

#### spacemanspiff

3.1415926

that's all i got. but that's without actually trying to memorize it. it may not be 150 decimal places, but most people look at me funny when i reel it off, and that's good enough for me

#### LURCH

I memorised it to 14 digits as a child. Based on a famous quotation by Albert Einstein: "How I need a drink. Alcoholic, of course, after the heavy chapters involving quantum mechanics." The number of letters in each word successively correspond to the digits in Pi.

I find it useful as a sort of "mantra", it helps me calm myself down when getting overly emotional. Maybe such numerical recitation would be useful in any activity requiring calm nerves and an even mind. Sniping, perhaps?

#### kyle_soule

I remember the exact number for &pi; ------> it's right under the space button on my HP48GX

Last edited:

#### Artman

Originally posted by pi-70679...
...If only considering those two statements, i would in fact seem like a complete maniac... Which i can reassure you i am not
That's a relief.

By the way, I think it's amazing that you have Pi memorized to 150 places. I consider myself lucky to be able to memorize my own phone number.

#### pimaster

so far i am in 2nd place....im a bit of a geek and i have memorized 32 place

3.14159265358979323846264338237950

just started today cause i was bored lol...trying to get to 50 by 2morrow

#### mathwonk

Homework Helper
i know 5 places. 3.1416, (rounded).

#### Ivan Seeking

Staff Emeritus
Gold Member
Which value of pi did you want?

The bill House Bill No. 246, Indiana State Legislature, 1897, reportedly set the value of pi to an incorrect rational approximation.

...The bill implies four different values for pi and one for sqrt(2), as follows: pi' = 16/sqrt(3), 2 sqrt(5 pi/6), 16 sqrt(2)/7, 16/5 ( 9.24 , 3.236 , 3.232 , 3.2 respectively.) sqrt(2)' = 10/7.
http://www.cs.uwaterloo.ca/~alopez-o/math-faq/mathtext/node18.html

### Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving