Online registration is closed for this event. If available, tickets on the day of the event may incur an additional charge.

Pi Day 2021:
Start your morning off right with some eye-opening pi…

Sunday, March 14
11:00 am to 12:00 pm ET (New York)

Pick up your fun Pi Day items — including the ever-popular pizza pi wheel — at MoMath:

Don't forget to set your clocks forward on Sunday, March 14, for the beginning of Daylight Saving Time.

11:00 am ET (New York): "Roping Around the World"
Come test your intuition with a mathematical problem about a rope tied around the Earth.  Explore the counterintuitive solution with an engaging, hands-on activity.

11:30 am ET (New York): "Why don't we celebrate Phi Day?"
Phi, also known as the Golden Ratio, is one of the most unique irrational numbers in all of mathematics.  Come learn about this fascinating number that shows up in all sorts of unexpected places, including a number of MoMath exhibits.  Then discover how the number pi, in contrast, truly is more special and deserving of its own holiday and how pi transcends the basic rules of arithmetic.

To fully participate in both sessions, have the following handy:

  • Paper
  • Pencil
  • Sheet of printer paper cut into ½-inch strips lengthwise
  • Ruler with inch measurements
  • Tape
  • Three paper clips
  • Simple calculator

To register for other Pi Day 2021 activities, visit

This is a live-streamed event.  Occasional video recordings are made available for a fee at

March 14, 2021 11:00 am   through   12:00 pm
MoMath Online
United States
Phone: 212-542-0566
Event Fee(s)
Free registration (while supplies last) $ 0.00
Reduced rate (while supplies last) $ 5.00
Event fee $ 15.00
Event fee plus $15 donation to support families in need $ 30.00

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