Important Days in Mathematics Celebrated in the World

Calendar of important Math days in 2025

1. E-Day (Eulers Number)

E-day is celebrated to celebrate the mathematical constant e, which is called as Euler’s Number and has a value of 2.7182818.
It is celebrated on 7th of February every year. The date is chosen from the the first two digits of the Euler’s Number i.e. from 2.7, where is 2 for february and 7 kept for date.

1. How Euler’s number is related to our daily math?
2. Find your birthday in Euler’s number
3. AMS blogs has a beautiful summary of Euler’s number

2. Fibonacci Day

Fibonacci Day is celebrated on 23rd of November every year. It is celebrated to honour Italian mathematician Leonardo Bonacci, the most talented Western Mathematician of the Middle Ages.
He is also known as Leonardo of Pisa and Leonardo Fibonacci. He introduced Europe to the Hindu-Arabic numeral system to ease the calculations with numbers unlike Roman numerals.
He introduced one of the most influential sequence of numbers called as Fibonacci Numbers, which further derives a unique ratio in mathematics, called as “Golden Ratio”. Surprisingly, Golden ratio can describe many phenomenon of nature to financial markets.
Fibonacci day is celebrated on 23rd November every year and the date 11/23 is selected because the digits in 11/23 makes the part of Fibonacci sequence i.e. 1, 1, 2, 3.

1. Where can we observe Fibonacci sequence in everyday life?
2. Know five ways to celebrate Fibonacci day
3. Activities to do on Fibonacci numbers

3. International Sudoku Day

International Sudoku Day is celebrated every year on September 9. The number 9 has been taken from the sudoku game that is played on 9 x 9 grid. On this day sudoku competitions are held and winner is declared who completes the sudoku puzzle te fastest. The day September 9 was officially declared by The World Puzzle Federation in 2013.

4. National Mathematics Day (India)

National Mathematics Day is celebrated in India on 22 December every year which is the birth anniversary of famous mathematician Srinivasa Ramanujan.
Srinivasa Ramanujan was an Indian mathematician who contributed to number theory, infinite series and continued fractions in his short span of life only.
He was the youngest to receive Fellows of the Royal Society and elected as Fellow of Trinity College, Cambridge.

1. National Mathematics Day 2024: History, significance and all you need to know

5. National Numeracy Day (UK)

National Numeracy Day is celebrated every year in the month of may in United Kingdom. Dates are announced by National Numeracy organisation. It was started in the year of 2018 by the National Numeracy organisation. They will conduct a Number Heroes Competition with a chance to win prizes for individuals. nurseries, schools or even youth groups.

Sign up for National Numeracy Day

1. Welcome to National Numeracy Day
2. Know about the challenge National Numeracy Day
3. Teaching resources to celebrate National Numeracy Day
4. Celebrating ideas for National Numeracy Day

6. Number Day (UK)

Number Day is celebrated in UK and is organised by the NSPCC charity who works for children to prevent abuse, help rebuild children’s lives and support families. In 2025, this will fall on 7 February.

Number Day is a fundraising math activities event which is free to join for children, nursery and schools and is the day is filled up with various game shows, current trends, tasks and teamwork from the participants.

Sign up for Number Day 2025

1. About Number Day

7. Palindrome Day

Palindrome Day is the day of the year which makes same pattern like Palindrome. Palindrome is word or a number which can be read in both forward and backward directions and reading in both directions makes the same word or the number.
For a day to be a palindrome it must be in a format of mm/dd/yyyy or mm/dd/yy.
In 2025, the Palindrome days will start from 20/05/2025 to 29/05/2025.

List of Palindrome Days in 2025

1. #PalindromeDay: Geeks around the world celebrate 02/02/2020
2. Why A Day Like Sunday Hasn’t Been Seen In 900 Years
3. Did you know there’s a 10-day stretch of palindrome dates this month

8. Pi Day (International Day of Mathematics)

Pi is the most famous number and a mathematical constant, which has a value of 3.142. It is observed on 14 March of every year. It is also known by the name of International Day of Mathematics from November, 2019 onwards.
The official website of International Day of Mathematics is The International Day of Mathematics (IDM).
It is observed on 3/14 because the three digits 3, 1 and 4 makes the first 3 numbers of Pi value.

To celebrate the upcoming International Day of Mathematics in the year 2025, the International Mathematical Union announced the theme Mathematics, Art, and Creativity. You can organize and decorate your own event to celebrate it.

9. Pythagorean Theorem Day

Pythagorean Theorem Day is celebrated all over the world to celebrate the famous theorem of Geometry Pythagoras Theorem. The date of celebration is calculated using the Pythagoras formula.
We know the Pythagoras formula states that the sum of squares of perpendicular and base is equal to the square of the hypotenuse.
The date of celebration in a year falls on the day when the sum of squares of date and month equals the square of the last two digits of the year.

The next Pythagorean Theorem Day in the future falls on 24 July, 2025.

10. Square Root Day

Square Root Day is the rarest mathematics day because it cannot be celebrated every year. Surprisingly, its occurrence is only 9 times in one century.
It is celebrated on the days when both date and month are the square root values of the last two digits of the year.
It was started by Ron Gordon, a high school teacher from Redwood City, California on September 9, 1981 (9/9/81).
The last square root day celebrated was on 4 April, 2016 (4/4/2016). The next upcoming Square Root Day is 5 May, 2025 (5/5/25).
Let’s take an example of square root day and see how it is calculated.

List of Square Root Days in a century

11. Women in Mathematics Day

Women in Mathematics Day is celebrated worldwide on 12th of May every year.
It is the day to celebrate for women in mathematics for their achievements in the field of mathematics and to encourage to an open, welcoming and inclusive environment for everybody.
The events to celebrate the day take place from 1 May to 15 June.
May 12 Initiative is the website whose goal is to inspire women everywhere in the world to celebrate their achievements in mathematics and to encourage an open, welcoming and inclusive work environment for everybody.

12. World Maths Day

World Maths Day is a global celebration of mathematics where millions of students aged 5 to 18 across the world compete in Live Mathletics challenges.
It’s free and open to schools all over the world. Any student aged from 5 to 18 years can participate and win the prizes.
If you would like to know when it will be celebrated in this year or interested to know how it works, what to do on the day and download World Maths Day Handbook, please visit World Maths Day by 3P Learning website.

When are the maths days in a year summary?