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### Author Topic: How to calculate Pi to 1,000,000 places in your head .  (Read 23500 times)

#### neptune

• Hero Member
• Posts: 1127
##### How to calculate Pi to 1,000,000 places in your head .
« on: April 14, 2011, 07:36:54 PM »
I used to be impressed when mathematical geniuses mentally calculated the value of Pi to a large number of decimal places in their heads .Then I spotted the trick .Pi= 22 divided by 7 = 3.142857 . If you continue to divide , the numbers after the decimal point just keep repeating . So Pi= 3.142857142857142857142857142857 and so on ad infinitum . Easy isnt it ?

#### rensseak

• Sr. Member
• Posts: 330
##### Re: How to calculate Pi to 1,000,000 places in your head .
« Reply #1 on: April 14, 2011, 07:46:58 PM »
I used to be impressed when mathematical geniuses mentally calculated the value of Pi to a large number of decimal places in their heads .Then I spotted the trick .Pi= 22 divided by 7 = 3.142857 . If you continue to divide , the numbers after the decimal point just keep repeating . So Pi= 3.142857142857142857142857142857 and so on ad infinitum . Easy isnt it ?

pi=3,14159265358979323846.......

you know, there is no repeating in pi

#### neptune

• Hero Member
• Posts: 1127
##### Re: How to calculate Pi to 1,000,000 places in your head .
« Reply #2 on: April 14, 2011, 08:15:41 PM »
Hi Rensseak .I was always taught that Pi is 22 divided by 7 . If this is true , I stand by my answer which was calculated by long division not using a calculator . I would be very interested in your answer .Are you saying that Pi is not 22 divided by 7 ? Update . I just Googled Pi . You are correct . Pi is not exactly equal to 22/7 .You wait until I see my old maths teacher....

#### e2matrix

• Hero Member
• Posts: 1947
##### Re: How to calculate Pi to 1,000,000 places in your head .
« Reply #3 on: April 14, 2011, 11:52:00 PM »
Yep 22/7 is just an easy way to remember the rough value of pi.  One of the unique things about pi has always been that even calculated out to a huge number of places it does not repeat.  Go get'em (silly math teacher)

#### the_big_m_in_ok

• Hero Member
• Posts: 2087
##### Re: How to calculate Pi to 1,000,000 places in your head .
« Reply #4 on: April 15, 2011, 04:48:02 AM »
Yep 22/7 is just an easy way to remember the rough value of pi.  One of the unique things about pi has always been that even calculated out to a huge number of places it does not repeat.  Go get'em (silly math teacher)
A math teacher in my high school told my class there was a mathematician who tried to divide pi as far as possible, but later computer programmers proved he mad a mistake about halfway through his career, and he wasted his time from then on.

Pi facts:

@neptune
Actual, arithmetic pi isn't cyclic; it's absolutely random.

--Lee

#### MasterPlaster

• Hero Member
• Posts: 529
##### Re: How to calculate Pi to 1,000,000 places in your head .
« Reply #5 on: April 15, 2011, 12:14:36 PM »
Quote
I was always taught that Pi is 22 divided by 7 .

.............

You wait until I see my old maths teacher....

This kind of teaching is criminal.

#### mscoffman

• Hero Member
• Posts: 1377
##### Re: How to calculate Pi to 1,000,000 places in your head .
« Reply #6 on: April 15, 2011, 05:47:43 PM »

@neptune
Actual, arithmetic pi isn't cyclic; it's absolutely random.

--Lee

Careful Lee, There are orders of randomness, just like there are orders
of infinity...there exists a computer
algorithm for computing the next decimal digit of pi without calculating
all the preceding digits...that algorithm represents a pattern. While
pi will appear to pass first order digit randomness tests...beating
deterministic random algorithms together, can cause less random,
more ordered outcomes then the product of their probabilities would
indicate.

:S:MarkSCoffman

#### neptune

• Hero Member
• Posts: 1127
##### Re: How to calculate Pi to 1,000,000 places in your head .
« Reply #7 on: April 15, 2011, 08:48:56 PM »
I seem to have knack of opening cans of worms! For the first time I begin to understand why some state [Tenessee ?] passed a law that henceforth , the value of Pi was to be taken as 3.

#### ResinRat2

• elite_member
• Hero Member
• Posts: 1242
##### Re: How to calculate Pi to 1,000,000 places in your head .
« Reply #8 on: April 15, 2011, 09:11:53 PM »
Henceforth, I decree that my Bank Account shall, from this moment forward, have the value of \$1,000,000.00 into perpetuity. No matter how much I pull out, its value shall never diminish nor increase from this number. So be it, on this date of April 15, AD2011, so let it be done!!

Now all I need to do is get the rest of the world to believe me. LOL!

This website cracks me up.

#### vonwolf

• Full Member
• Posts: 144
##### Re: How to calculate Pi to 1,000,000 places in your head .
« Reply #9 on: April 16, 2011, 04:56:10 AM »
I went to school with a kid that had pi memorized out to 3000 places, he wanted to get into to Guinness book of world records. He had a book that had 10 digits in 10 line blocks. You could give him any page and count down say 5 blocks and 3 blocks in and ask him the 3rd row and he could rattle off that 10 digit row, it was quite impressive.
and no he never got the record, too many rules just try to get a public official to sit and verify some 16 year old kid rattling off pi to the 3000Th digit.
Pete

#### giantkiller

• TPU-Elite
• Hero Member
• Posts: 2791
##### Re: How to calculate Pi to 1,000,000 places in your head .
« Reply #10 on: April 16, 2011, 06:42:00 AM »
There is an announcer on Klove that you give him any town and state and will tell you the area code off the top of his head and he never fails. Wierd.

#### neptune

• Hero Member
• Posts: 1127
##### Re: How to calculate Pi to 1,000,000 places in your head .
« Reply #11 on: April 16, 2011, 04:16:13 PM »
I am pleased I started this discussion even though I got my facts wrong .@giantkiller . I was once privileged to meet a so called "idiot savant" . if you quoted him any date in the last 50 years , he could tell you what day it fell on . I went to a lot of trouble to check , and he was never wrong . Sadly I forgot to ask him the value of Pi... There is a lesson for us all here . Do not believe all you learn at school . Might this include the laws of thermodynamics?