35 Pi Day Trivia Questions and Answers You Don't Want To Miss

Did you know there are holidays for almost everything? While the U.S. may have 11 official federal holidays, there are actually thousands of quirky, themed days that make the calendar a whole lot more fun! One of the best—and most delicious—is Pi Day. However, while many celebrate it in March with dessert, Pi Day isn’t about that kind of pie—it’s actually a day all about numbers. So while pie may be on the menu, the real star of the day is math! And we've got the very best Pi Day trivia questions and answers to entertain you.

This number-themed day dates back to 1988, when physicist Larry Shaw decided to host a circle walk to honor the mathematical π Symbol, which represents the value 3.1415926535897932384626433832…, but is often approximated to 3.14. People loved it so much that the day ended up becoming an annual tradition. Fast forward twenty years and the U.S. House of Representatives officially declared Pi Day a holiday—making it the perfect excuse to indulge in some delicious pie while celebrating the wonders of math.

To celebrate the number-infused day, we rounded up some trivia questions to put your Pi knowledge to the test! Whether you’re a math whiz or just here for fun, these questions will have you thinking, laughing, and maybe even scratching your head. So get ready to dive into the world of Pi and see how well you really know this legendary number—you might just surprise yourself. Let the trivia begin!

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When Is Pi Day?

Pi Day rolls around every year on March 14. It is observed on March 14 because 3, 1, and 4 are the first three significant figures of π, making the date (3/14) a perfect match to honor the mathematical constant. This year, it will fall on the second Friday of the month, giving everyone an excuse to embrace some mathematical fun as the weekend begins!

What Is Pi Day?

Pi Day is a celebration of the endlessly fascinating number Pi (π), which starts as 3.14 and stretches on forever without repeating! It’s a day dedicated to this mysterious mathematical constant that helps us measure circles, from their circumference to their area. Pi is so special because no matter how many digits you calculate, it never settles into a predictable pattern, making it both mysterious and endlessly fascinating.

On Pi Day, people often enjoy pie, share math jokes and dive into the fun of numbers. It’s the perfect day to geek out over numbers and the magic they bring to the world!
What Is Pi Day?

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35 Pi Day Trivia Questions and Answers You Don't Want To Miss

1. How many known digits are there of Pi?
Answer: 6.4 billion

2. What is the term for Pi being an infinite, non-repeating number?
Answer: Irrational Number

3. What is the longest number of digits of Pi memorized by anyone?
Answer: 70,000 digits by Rajveer Meena in 2015

4. Which famous physicist is known for reciting Pi to over 700 digits?
Answer: Albert Einstein

5. How many years has Pi Day been celebrated as a national holiday in the U.S. as of 2025?
Answer: 16 years

6. What is the most commonly occurring number in the first 100,000 decimal places of Pi?
Answer: the number 1, which occurs over 10,000 times!

7. What is the term used for the attempt to memorize as many digits of Pi as possible?
Answer: Pi Recitation

8. Which number is Pi closest to in its simplest form?
Answer: 22/7

9. Which number comes right after Pi in the sequence of decimal digits?
Answer: 1 (3.1415...)

10. What is Pi Day’s official website?
Answer: PiDay.org

11. What does the Greek letter “π” represent in math?
Answer: Pi, the ratio of a circle’s circumference to its diameter.

12. Which animal’s name has been used as a fun reference to Pi Day?
Answer: Pi-thon (a play on the word “python”)

13. What’s Pi Day’s mascot?
Answer: A friendly Pi symbol, often drawn with a pie

14. Pi Day celebrations often include an actual race—what kind of race?
Answer: A “Pi-mile” race (3.14 miles)

15. Which U.S. House of Representatives member helped make Pi Day an official holiday?
Answer: Rep. Mike Honda of California

16. Which comedian was famous for saying, “Pi is 3.14159...and that's all I know!”?
Answer: Stephen Colbert

17. How long is Pi Day’s “Pi” parade in San Francisco?
Answer: 3.14 miles

18. In which year did Pi Day first become an official holiday?
Answer: 2009

19. What was Larry Shaw’s nickname?
Answer: Prince of π

20. What is the first major mathematical theorem that involves Pi?
Answer: The Pythagorean Theorem

21. What is the name of the event where people compete to see who can recite the most digits of Pi?
Answer: Pi Recitation Contest

22. In the movie Life of Pi, what does the “Pi” in the title represent?
Answer: The main character’s name, not the mathematical constant

23. Pi Day and Einstein’s birthday fall on the same date—what is it?
Answer: March 14

24. Pi is a “transcendental number.” What does this mean?
Answer: It cannot be the root of any non-zero polynomial equation with rational coefficients.

25. Who is William Jones?
Answer: He was the first mathematician to use the Pi symbol.

26. True or False: π is a Greek symbol.
Answer: True

27. What year did Pi Day first begin to be celebrated as a public event?
Answer: 1988

28. Who first started celebrating Pi Day in 1988?
Answer: Larry Shaw, a physicist at the Exploratorium in San Francisco

29. How many years do mathematicians estimate it would take for a person to recite the 6.4 billion known digits of Pi without stopping?
Answer: 133 years

30. What is the numerical value of Pi, rounded to two decimal places?
Answer: 3.14

31. Which Olympic gymnast shares a birthday with Pi Day?
Answer: Simone Biles

32. How many times can all the digits of Pi wrap around the world?
Answer: Since pi goes on forever, its digits can wrap around the entire world an infinite number of times

33. Which popular dessert is often associated with Pi Day?
Answer: Pie (because it’s a fun pun on the word “Pi”)

34. Why is Pi Day celebrated on March 14?
Answer: Because the date 3/14 represents the first three digits of Pi (3.14)

35. In which U.S. city did the first public Pi Day celebration take place?
Answer: San Francisco

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