Mathematical Holidays
Incorporate math-y fun throughout the year with this collection of math holidays to celebrate!
Annual Mathematical Holidays
This collection of mathematical holidays is celebrated on a yearly basis.
e Day – February 7th
e Day is celebrated on February 7 (2/7) because the mathematical constant e is approximately 2.718.
e Day honors Euler’s number, a fundamental constant in mathematics that appears in exponential growth, compound interest, calculus, and many real-world modeling situations—making it a great excuse for classroom activities connected to functions and change.
Pi Day – March 14th
Pi Day is celebrated on March 14 (3/14) because the date matches the first three digits of π: 3.14.
Pi Day honors the mathematical constant pi, which represents the ratio of a circle’s circumference to its diameter and is a perfect opportunity for hands-on geometry, measurement, and circle-themed classroom activities.
Metric Day – October 10th
Metric Day is celebrated on October 10 (10/10), a nod to the base-10 structure of the metric system.
Metric Day honors the metric system of measurement and gives teachers a perfect chance to reinforce unit conversions, prefixes, and real-world measurement skills in a hands-on way.
Here are just a few of my ideas for celebrating Metric Day in the classroom:
Ada Lovelace Day – October 13, 2026
Ada Lovelace Day is celebrated on the second Tuesday of October each year.
Ada Lovelace Day honors Ada Lovelace, widely regarded as the world’s first computer programmer, and is a great opportunity for teachers to highlight women’s contributions to mathematics, computing, and STEM history.
Here are just a few of my ideas for celebrating Ada Lovelace Day in the classroom:
Celebration of Mind Day – October 21st
Celebration of Mind Day is celebrated on October 21, the birthday of Martin Gardner, a well-known recreational mathematian.
Celebration of Mind Day honors his legacy of making mathematics, puzzles, games, and magic accessible and joyful, encouraging teachers to celebrate curiosity, problem-solving, and playful thinking in the classroom.
Mole Day – October 23rd
Mole Day is celebrated on October 23 from 6:02 a.m. to 6:02 p.m., reflecting Avogadro’s number, 6.02×10^23.
Mole Day honors the mole as a fundamental unit in chemistry and is a fun way for teachers to connect math skills like scientific notation and powers of ten to real-world science concepts.
Fibonacci Day – November 23rd
Fibonacci Day is celebrated on November 23 (11/23) because the date reflects the beginning of the Fibonacci sequence: 1, 1, 2, 3.
Fibonacci Day honors the Fibonacci sequence and is a great opportunity for teachers to connect patterns, recursion, and nature-inspired math through engaging classroom explorations.
Here are just a few of my ideas for celebrating Fibonacci Day in the classroom:
Irregular Math Holidays
These math holidays are extra fun to celebrate because they don’t happen every year!
Perfect Square Day
Perfect Square Day is celebrated on dates where the month, day, and two digit year are perfect squares.
Perfect Square Day honors perfect square numbers and is a natural fit for classroom activities involving area models, arrays, and visualizing the connection between multiplication and geometry.
Upcoming Perfect Square Days
Unfortunately, Perfect Square Day will not be celebrated again until 2036. But, you will have 15 different opportunities over the course of 2036 to celebrate Perfect Square Day. Make sure you take advantage of some of them because Perfect Square Day won’t roll around again until 2049!
- 1/1/36 → Jan 1, 2036
- 1/4/36 → Jan 4, 2036
- 1/9/36 → Jan 9, 2036
- 1/16/36 → Jan 16, 2036
- 1/25/36 → Jan 25, 2036
- 4/1/36 → Apr 1, 2036
- 4/4/36 → Apr 4, 2036
- 4/9/36 → Apr 9, 2036
- 4/16/36 → Apr 16, 2036
- 4/25/36 → Apr 25, 2036
- 9/1/36 → Sep 1, 2036
- 9/4/36 → Sep 4, 2036
- 9/9/36 → Sep 9, 2036
- 9/16/36 → Sep 16, 2036
- 9/25/36 → Sep 25, 2036
Perfect Square Day Activities
Pythagorean Theorem Day
Pythagorean Theorem Day is celebrated on dates where the month, day, and year form a Pythagorean triple.
Pythagorean Theorem Day honors the Pythagorean Theorem, giving teachers a fun way to explore right triangles, number patterns, and real-world applications of geometry in the classroom.
Upcoming Pythagorean Theorem Days
The next pythagorean triple date will be on October 24, 2026 since 102 + 242 = 262. Make sure you celebrate this one unless you plan on being alive for the next Pythagorean Theorem Day on April 3, 2105.
Pythagorean Day Activities
School Year Holidays
The school year gives plenty of opportunities to celebrate various number-based holidays based on the number of days of the school year that have been finished so far.
50th Day of School
The 50th Day of School is typically celebrated on the 50th instructional day of the school year, often falling in late October or early November.
It honors the milestone of reaching 50 days of learning and is a favorite classroom celebration for practicing place value, counting, and number sense through fun, age-appropriate math activities.
67th Day of School
The 67th Day of School is celebrated on the 67th instructional day of the school year, often landing in early December.
It honors the viral numbers 6 and 7 and is a fun classroom opportunity for teachers to explore factors, prime and composite numbers, and creative number representations as part of number sense and math fluency activities.
100th Day of School
The 100th Day of School is celebrated on the 100th instructional day of the school year, usually in late January or early February.
It honors students’ progress through 100 days of learning and is a perfect classroom milestone for exploring place value, counting, patterns, and number sense in engaging, hands-on ways.
