Public Event
Celebrate Pi Day with NASA
When:
The answers to the 2023 NASA Pi Day Challenge are here!Where:
OnlineTarget Audience:
K12 students and educators, parents, museums, science centers and planetariumsOverview:
Update: March 15, 2023 – The answers are here! Visit the NASA Pi Day Challenge page to view the illustrated answer keys for each problem.
NASA is joining schools, students and science centers across the U.S. to celebrate one of the most well known and beloved numbers: pi. Used throughout the STEM world – especially for space exploration! – pi is the number that results from dividing the circumference of any circle by its diameter. Pi can be and often is rounded to 3.14 (even though its decimals never end), which is why 3/14 has been designated National Pi Day.
Pi Day gives us a reason to celebrate the mathematical wonder that helps NASA explore the universe. And we're giving students a chance to join in the fun by using pi to explore Earth and space themselves in our 10th annual NASA Pi Day Challenge.
Plus, explore our collection of evergreen Pi Day Challenge problems, articles about how we use pi at NASA, and free downloads, including mobile phone and desktop backgrounds.
Pi Day Challenge Resources

NASA Pi Day Challenge
This collection of illustrated math problems gets students using pi like NASA scientists and engineers exploring Earth and space.
Grades 412
Time Varies

Pi in the Sky Lessons
Find everything you need to bring the NASA Pi Day Challenge into the classroom, including printable handouts of each illustrated math problem.
Grades 412
Time Varies
Articles

Teachable Moments: 10 Years of NASA's Pi Day Challenge
Learn more about pi, the history of Pi Day before, and the science behind the 2023 NASA Pi Day Challenge.

18 Ways NASA Uses Pi
Whether it's sending spacecraft to other planets, driving rovers on Mars, finding out what planets are made of or how deep alien oceans are, pi takes us far at NASA. Find out how pi helps us explore space.

How Many Decimals of Pi Do We Really Need?
While you may have memorized more than 70,000 digits of pi, world record holders, a JPL engineer explains why you really only need a tiny fraction of that for most calculations.

10 Ways to Celebrate Pi Day With NASA on March 14
Find out what makes pi so special, how it’s used to explore space, and how you can join the celebration with resources from NASA.

National Council of Teachers of Mathematics: Notice and Wonder
Creative brainstorming through noticing and wondering encourages student participation, engagement, and students' understanding of the NASA Pi Day Challenge.
Subject Mathematics
Multimedia & Downloads

Downloads
Can't get enough pi? Download this year's NASA Pi Day Challenge graphics, including mobile phone and desktop backgrounds:

Infographic: Planet Pi
This poster shows some of the ways NASA scientists and engineers use the mathematical constant pi (3.14) and includes common pi formulas.
Join the Conversation

Pi Day: What's Going 'Round
Tell us what you're up to this Pi Day and share your stories and photos on our showcase page.
Join the conversation and share your Pi Day Challenge answers with @NASAJPL_Edu using the hashtag #NASAPiDayChallenge on Facebook, Twitter, and Instagram.