What do you get if you divide the circumference of a jack-o’-lantern by its diameter? Pumpkin π.

Joke from comedian John Evansfrom 50 Interesting Facts About Pi

PickyKidPix came home from school after Pi Day last year determined to memorize 100 digits of Pi. Her math teacher offered 1 point of extra credit for learning Pi. He rarely offers extra credit so she decided that she was going to learn 100 digits of Pi.

Al-Khwarizmi, who lived in Baghdad around A.D. 800, worked on a value of pi calculated to four digits: 3.1416. The term “algorithm” derives from his name, and his text Kitab al-Jabr wal-Muqabala (

The Book of Completion Concerning Calculating by Transposition and Reduction) gives us the word “algebra” (fromal-Jabr,which means “completion” or “restoration”).from 50 Interesting Facts About Pi

Her goal was to learn 40 digits a day, thus mastering 100 in three days. She used an app — Learn Pi Free — to help her. She sang the numbers. She recited the numbers. And she wrote down the digits of Pi … everywhere!

Ludolph van Ceulen (1540-1610) spent most of his life calculating the first 36 digits of pi (which were named the Ludolphine Number). According to legend, these numbers were engraved on his now lost tombstone.

from 50 Interesting Facts About Pi

She used Chalk Ink on her sister’s window.

In 2002, a Japanese scientist found 1.24 trillion digits of pi using a powerful computer called the Hitachi SR 8000, breaking all previous records.

from 50 Interesting Facts About Pi

She used white board markers on a Think Board (it’s a peel and stick dry erase sheet) that she put on her desk hutch too.

I noticed that she tried to find patterns in the number groupings which reminded me of Clare Vanderpool’s chapter book * Navigating Early *in which a young boy, Early, was convinced that there was a story in the numbers of Pi.

Scientists in Carl Sagan’s novel

Contactare able to unravel enough of pi to find hidden messages from the creators of the human race, allowing humans to access deeper levels of universal awareness.from 50 Interesting Facts About Pi

Carl Sagan’s **Cosmos** also has a story line of finding a message coded in the numbers of Pi. Could it be that there is more to Pi than the ratio of a circle’s circumference to its diameter?

After her three days of extensive study, I asked her how her extra credit test went. She said that her teacher only asked for 10 or 15 units of Pi, but that she decided to challenge herself to learn 100.

The first 144 digits of pi add up to 666 (which many scholars say is “the mark of the Beast”). And 144 = (6+6) x (6+6).

from 50 Interesting Facts About Pi

How about you? Any interest in looking into the mysteries of Pi?

p.s. Can you find your birthday in Pi? Search for it here.

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I’d never be able to remember that! I just love the idea of Pi day too–so fun!

Hi Maria,

She spent two days writing out Pi to memorize it. I think she got extra credit points for it, but it was worth it to her!

Pragmatic Mom recently posted…The Nian Monster Chinese New Year Author Event

I can’t believe that Pi day is tomorrow. Remember you post last year. I just read a PB book review yesterday for kids about the young Carl Sagan. Was so surprised. It was reviewed in Susanna Leonard Hill’s PPBF. Interesting post, as usual!

Patricia Tilton recently posted…The Warden’s Daughter by Jerry Spinelli

Hi Pat,

That picture book on Carl Sagan sounds great! Will be on the lookout for it! Thanks!

Pragmatic Mom recently posted…The Nian Monster Chinese New Year Author Event

I was able to find my birthday. Happy Pi Day!

maryanne recently posted…Are You Recording Your Family’s Women’s History?

Hi MaryAnne,

That makes a great post for next year’s Pi Day! I’m going to look for mine too!

Pragmatic Mom recently posted…The Nian Monster Chinese New Year Author Event

Cool! ๐ I remember we had a contest in sixth grade to see who could memorize the most digits. (I didn’t win)

Erik Weibel recently posted…Perfect Picture Book Friday! Bogo, The Fox Who Wanted Everything by Susanna Isern

Hi Erik,

What a fun contest! Was there a prize? It should be pie … ๐

Pragmatic Mom recently posted…The Nian Monster Chinese New Year Author Event

What a great post, full of interesting facts! I’m a pi lover ๐

Jemima Pett recently posted…Book Review | Dying Fall by Elly Griffiths

Thanks Jemima! Pi is fascinating to me too!

Pragmatic Mom recently posted…The Nian Monster Chinese New Year Author Event

Oops! Got here a little late for the celebration! My husband’s a high school math teacher so we are all about Pi!

Hi Cheryl,

What a wonderful connection to math and Pi Day!!

Pragmatic Mom recently posted…The Nian Monster Chinese New Year Author Event

Naila Moon

Thanks for this post. It explained a mystery of Pi to me. ๐

Hi Naila,

I’m glad you liked it! Pi is such an interesting concept and number.

Pragmatic Mom recently posted…Ten Picture Books That Spark Courage & 3 Book GIVEAWAY!