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: “Hailstone Numbers”
Thursday, September 16, 2:00 pm to 2:45 pm ET (New York)
Hail is formed when ice repeatedly travels up and down within a cloud, growing and shrinking until its mass is steady enough to fall to the ground as hail.  Hailstone numbers are repeated patterns of numbers with the same property.  They increase and decrease sporadically according to a set rule until they finally plummet in size and eventually become the number 1.  These number sequences are easy to create but often impossible to fully understand.  Come learn what these numbers are, why they are so mystifying, and how they might just represent the next big breakthrough in mathematics.  Materials needed: pencil and paper.

Register for “Hailstone Numbers” on September 16

Senior Sessions: “Exhibit Explorations: Math Square
Tuesday, September 21, 2:00 pm to 2:45 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 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 September 21

Senior Sessions: “Roping Around the World”
Friday, September 24, 2:00 pm to 2:45 pm ET (New York)
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.  How can we use C=2*pi*r to understand this intriguing problem?  Learn how simple models can help us better understand concepts that defy logic.  Materials needed: pencil, paper, ruler with inch measurements, tape, 3 paper clips, scissors, and sheet of 8-½ x 11 paper cut lengthwise into ½-inch strips.

Register for “Roping Around the World” on September 24

Senior Sessions: “Sensational Puzzles”
Monday, September 27, 2:00 pm to 2:45 pm ET (New York)
Explore mathematical puzzles that grabbed the headlines!  Learn to solve spectacular and controversial puzzles using logic, probability, and basic graph theory.  Develop puzzle-solving strategies while diving into these news-making mathematical conundrums.  Materials needed: pencil and paper.

Register for “Sensational Puzzles” on September 27

Senior Sessions: “Magic Squares”
Thursday, September 30, 2:00 pm to 2:45 pm ET (New York)
Magic squares are a set of puzzles that have long fascinated many of the world’s most brilliant thinkers.  Dating back more than 4,000 years to ancient China, magic squares are those in which the sums of each column, row, and diagonal are always “magically” the same number!  Discover surprising strategies to solve these mysterious puzzles and learn how to create your very own magic square.  Materials needed: pencil and paper.

Register for “Magic Squares” on September 30

Senior Sessions: “Vote Counts: Ranking and Tanking”
Tuesday, October 5, 2:00 pm ET (New York)

Voting for a preference may seem simple, but when multiple options exist, the math gets complicated!  The different methods of counting the vote can often result in different winners.  Explore the mathematics behind various vote-counting systems and develop a deeper understanding of what it means for a system to be equitable.  Materials needed: pencil and paper.

Register for “Vote Counts: Ranking and Tanking” on October 5

Senior Sessions: “Skipping Towards Infinity” (new!)
Friday, October 8, 2:00 pm ET (New York)

Is it possible to add infinitely many things and end up with a single finite number?  Sometimes, but the arithmetic of infinity obeys its own strange rules.  Achilles and the Tortoise never quite mastered them!  Explore this classic paradox and other surprising and other unexpected results that arise when considering the mathematics of infinity.  Materials needed: pencil, paper (at least 3 sheets of 8.5 x 11 paper), and calculator (optional).

Register for “Skipping Towards Infinity” on October 8

Senior Sessions: “Tangram Teasers”
Monday, October 11, 2:00 pm ET (New York)

Exercise your mind and stretch your spatial reasoning while searching for solutions to fun tangram puzzles.  Learn to create specific figures by combining seven polygons.  If you get stuck, try another way!  Discover multiple strategies to solve these classic dissection puzzles.  Materials needed: scissors, printout to be provided, and tangram puzzle set (optional).

Register for “Tangram Teasers” on October 11

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: “Luck, Magic, or Math?” (new!)
Tuesday, October 19, 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 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: “Breaking Codes”
Tuesday, October 26, 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 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

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