Senior Sessions

Twice a week (through May)
Once a week (June and July)
2:00 pm to 2:45 pm ET (New York) (through June)
3:00 pm to 3:45 pm ET (New York) (July)



Seniors citizens, exercise your brain in 45-minute math sessions!  Join MoMath’s experienced presenters for intriguing classes on a variety of stimulating topics, including topology, puzzles, and cryptography.  Enjoy the discovery and challenges in these engaging, interactive activities with a collegial cohort of mature minds.  For senior citizens / mature adults.  Online registration closes 15 minutes before each session begins.

Please note that sessions of the same name are repeated sessions.


Senior Sessions: “Math in the Corner Pocket”
Friday, May 27, 2:00 pm ET (New York)
Explore angles and the law of reflection while tracing the path of a billiard ball as it bounces off the walls of a pool table.  Use patterns to discover a simple method to predict in which pocket the ball will land and learn how to prove that your prediction is correct.  Game on!  Materials needed: pencil, ruler, and graph paper (printout available).

Register for “Math in the Corner Pocket” on May 27


Senior Sessions: “Breaking Codes”
Tuesday, May 31, 2:00 pm ET (New York)
How do computers keep your passwords secret?  How do websites safeguard your credit card numbers?  Explore multiplicative ciphers, broken codes, and prime numbers, while encoding and decoding your own secret messages.  Learn how cryptography helps protect your private information.  Materials needed: pencil, paper, and calculator (optional).

Register for “Breaking Codes” on May 31


Senior Sessions: “Vote Counts: Tower of Power”
Thursday, June 9, 2:00 pm ET (New York)
Explore the different ways power can be distributed in weighted voting systems.  These systems are those in which different groups have different numbers of votes, such as county delegations, government committees, and even the United States Electoral College.  Should the largest populations have the most power?  Should smaller groups have a voice?  Answering these questions is far more complex than simple majority rule, but modern mathematical analysis provides a useful lens through which to analyze unbalanced voting power.  (Please note: This is the third installment of the Vote Counts series; participants need not have attended the other two.)  Materials needed: pencil and paper.

Register for “Vote Counts: Tower of Power” on June 9 


Senior Sessions: “Math in Art: Tessellations I”
Monday, June 13, 2:00 pm ET (New York)
Discover the wonderful world of tessellations!  Explore how geometric shapes can completely cover a plane with no gaps or overlaps and discover where tessellations appear: in nature, in ancient Roman mosaics, in Islamic art and architecture, in quilting patterns, and in the works of modern artists such as M.C. Escher.  Join us to build your own tessellations with regular polygons in this first offering in the Math in Art series.  Materials needed: pencil, paper, scissors, printout to be provided, and pattern blocks set (optional).

Register for “Math in Art: Tessellations I” on June 13


Senior Sessions: “Topological Tic-Tac-Toe”
Friday, June 24, 2:00 pm ET (New York)
The familiar game of tic-tac-toe becomes fun and challenging when played on alternative topological surfaces.  The typical 3×3 game board is enhanced by gluing pairs of opposite edges together in various ways, making for more interesting games and mind-bending playing spaces.  Participants learn to appreciate the ins and outs of these new objects as they develop strategies to master the mathematically enhanced games.  Materials needed: pencil and paper.

Register for “Topological Tic-Tac-Toe” on June 24


Senior Sessions: “Cryptarithmetic”
Tuesday, June 28, 2:00 pm ET (New York)
Arithmetic is fun, but arithmetic with letters is even better!  Using process of elimination and clever logic, we will explore fundamental properties of base-10 arithmetic in a unique and challenging way.  Join us for CRYPT4R1THM3T1C!  Materials needed: pencil and paper.

Register for “Cryptarithmetic” on June 28


Senior Sessions: “Exhibit Explorations: Math Square
Thursday, July 7, 3:00 pm ET (New York)
The interactive Math Square floor is the centerpiece of the Museum’s lower level, and among its varying programs is a Voronoi diagram, which creates colorful polygons under your feet.  Learn exciting details about this Museum exhibit and also how to make your very own Voronoi diagram.  Materials needed: pencil, paper, colored pens (or pencils/markers), and ruler (triangle ruler optional).

Register for “Exhibit Explorations: Math Square” on July 7


Senior Sessions: “Alternative Perspectives
Monday, July 11, 3:00 pm ET (New York)
Recently featured in MoMath’s Composite gallery, artist Anton Bakker’s work will take you on a journey into a world of mathematical beauty with an added twist: a change in perspective seems to change the very reality of the object before us.  Lines, curves, knots, spirals, Möbius strips, optical illusions, and fractals — all are explored in this highly engaging virtual tour.  Discover these stunning sculptures and try your own hands-on activities!  Materials needed: pencil, paper, scissors, tape, and colored pens or markers (2 to 4 colors).

Register for “Alternative Perspectives” on July 11


Senior Sessions: “Luck, Magic, or Math?”
Friday, July 22, 3:00 pm ET (New York)
At first glance, the occurrence of an “unlikely” event might seem like luck… or magic.  However, when this event occurs over and over, we have to look more closely.  With a bit of math, we will see that some events, which might seem unlikely at first, have a higher probability than intuition would suggest.  Learn how a clever magician can “read the minds” of an unsuspecting audience using a little knowledge of probability!  Materials needed: pencil, paper, colored pens or markers (3 different colors), deck of playing cards, a single die, and printout of poems (to be provided).

Register for “Luck, Magic, or Math?” on July 22


Senior Sessions: “Math of the Pandemic”
Tuesday, July 26, 3:00 pm ET (New York)
Pandemics affect individuals and groups differently.  Explore how individual choices may determine, for example, the trajectory of the COVID-19 pandemic in the population.  Get a glimpse of game theory, a branch of mathematics that provides us with the tools to understand and analyze these important interactions.  Materials needed: pencil and paper.

Register for “Math of the Pandemic” on July 26


This program is intended for adults; children will not be permitted to attend, and event registrations are non-refundable and non-transferrable.

Share the gift of math!  Gift registrations for Senior Sessions available at