Senior Sessions

Twice a week (weekdays)
2:00 pm to 2:45 pm ET (New York)



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: “Vote Counts: Packing and Cracking”
Thursday, October 14, 2:00 pm ET (New York)

Get a glimpse into the mathematics of elections by becoming a “legislator” for a day.  Explore how election districts are drawn, including “packing,” “cracking,” and the meaning of wasted votes, in order to analyze the fairness of representation in an election.  Materials needed: paper, pencil, colored pens (or markers), and printout to be provided.

Register for “Vote Counts: Packing and Cracking” on October 14

Senior Sessions: “Breaking Codes”
Tuesday, October 19, 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 October 19

Senior Sessions: “Polyomino Puzzlers”
Friday, October 22, 2:00 pm ET (New York)

You’ve heard of dominoes, but have you ever heard of trominoes, tetrominoes, or pentominoes?  Discover the many surprising shapes you can create simply by combining single-size squares.  Explore various types of symmetry using these unique objects.  Materials needed: printout to be provided, pencil, and colored pen (or marker).  Optional materials: scissors, tape.

Register for “Polyomino Puzzlers” on October 22

Senior Sessions: “Luck, Magic, or Math?” (new!)
Tuesday, October 26, 2:00 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 October 26

Senior Sessions: “Math in the Corner Pocket”
Thursday, October 28, 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 your prediction is correct.  Game on!  Materials needed: pencil, ruler, and graph paper (printout to be provided). 

Register for “Math in the Corner Pocket” on October 28

Senior Sessions: “Vote Counts: Tower of Power”
Tuesday, November 2, 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 amounts 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; it is not necessary to have attended the other two.)  Materials needed: paper and pencil.

Register for “Vote Counts: Tower of Power” on November 2

Senior Sessions: “Finding Fibonacci”
Friday, November 5, 2:00 pm ET (New York)
1, 1, 2, 3, 5, 8, 13, . . .  The Fibonacci sequence is one of the most famous number patterns in all mathematics.  Join us to solve intriguing puzzles, explore hidden patterns, and discover the fascinating secrets that are concealed within this very special arrangement of numbers.  Materials needed: pencil, paper, and colored pens or markers (2 different colors).

Register for “Finding Fibonacci” on November 5

Senior Sessions: “Topological Tic-Tac-Toe”
Tuesday, November 9, 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 November 9

Senior Sessions: “Math of the Pandemic”
Thursday, November 11, 2:00 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 November 11

Senior Sessions: “Exhibit Explorations: Pythagorean Puzzlers”
Monday, November 15, 2:00 pm ET (New York)
The Pythagorean theorem is one of the most important results in all of mathematics.  There are more than 120 geometric proofs currently known!  Explore geometric proofs in this hands-on workshop based on MoMath’s Time Tables exhibit.  Materials needed: pencil, paper, colored pens (or pencils/markers), ruler, scissors, and graph paper (printout to be provided).

Register for “Exhibit Explorations: Pythagorean Puzzlers” on November 15

Senior Sessions: “Fractal Fascinations”
Friday, November 19, 2:00 pm ET (New York)
Fractals are beautiful and mysterious objects with properties that defy the normal rules of geometry, often consisting of iterated, miniature versions of itself.  Learn about the most famous fractals and what makes them so unusual.   Materials needed: pencil and paper.

Register for “Fractal Fascinations” on November 19

Senior Sessions: “Dynamic Dice”
Monday, November 22, 2:00 pm ET (New York)
What is the probability of rolling a given sum with a pair of standard dice? Explore how to determine that probability and then challenge yourself to find a different way to number the dice to get the very same probabilities.  Come roll the dice!  Materials needed: pencil and paper.

Register for “Dynamic Dice” on November 22

Senior Sessions: “Cryptarithmetic”
Friday, November 26, 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 November 26

Senior Sessions: “Exhibit Explorations: Math Square
Tuesday, November 30, 2:00 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 the visitors’ feet.  Learn exciting details about the Museum exhibit and also how to make your very own Voronoi diagram.  Materials needed: pencil, paper, colored pens (or pencils/markers), and triangle ruler (optional) or ruler.

Register for “Exhibit Explorations: Math Square” on November 30

Please note that program fees are non-refundable.  This program is for adults; MoMath reserves the right to remove children from a session without refund.

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