Math Encounters

Math Encounters is MoMath’s popular free public presentation series celebrating the spectacular world of mathematics, produced with support from the Simons Foundation.  For further information, call the National Museum of Mathematics at 212-542-0566 or email

Coming this September

Math Encounters:

“Hidden Patterns: the shape of multiplication”

featuring Federico Ardila Mantilla

Wednesday, September 7
4:00 pm and 7:00 pm ET (New York)

(in person/online)

You probably had to memorize the multiplication table at some point in your life, but you may not have noticed that there are two beautiful shapes hiding within. Join mathematician Federico Ardila Mantilla as he helps us discover these hidden polyhedra and shares some other unexpected places where they also — surprisingly — appear.

Special introduction by Daniel Alarcón, novelist, journalist, radio producer, and professor at the Columbia Journalism School.


Photography notice

By registering for a Math Encounters presentation, you acknowledge that you may be photographed or videotaped by Museum staff and associates and agree to abide by the MoMath General Policies for Events and Photograph Release.

Books by the speakers

We are happy to offer books edited or authored by Math Encounters speakers through our online shop.

Math Encounters available on YouTube and DVD

Math Encounters presentations are generally posted to our YouTube page within one to two months of filming.  Due to copyright issues, some presentations may not be reproduced on the internet.  Presentations posted online are also available for purchase via our online shop.  Click here to purchase yours today!

Presented by the Simons Foundation and the National Museum of Mathematics.

Please note that all children under the age of 16 must be accompanied by an adult.