*Recreational mathematics* is mathematics done for
recreation or as a hobby and intended to be fun.
Typically it involves games or puzzles that
relate to mathematics, although the term can cover other material.
Typically, recreational mathematics involves general
logical
and lateral thinking skills,
as opposed to advanced mathematical concepts,
so that the average person
is at least able to understand and appreciate a recreational problem
and its solution.
Recreational puzzles can also increase people's appreciation of
mathematics as a whole.

Recreational mathematics can be surprisingly popular, with millions of people at one time or another having enjoyed Rubik's Cube, fractals, Sudoku, logic problems, certain types of lateral thinking puzzles, and many other diversions. Other mathematical recreations include mathematical puzzles, mathematical chess puzzles, Conway's Game of Life, tangrams, and more.

However, it should not be assumed that recreational mathematics is without any practical use. Recreational mathematics has spurred the development of several fields of mathematics; to take one example, the problem of the Königsberg Bridges influenced the development of the field of graph theory.

Many pages on this site relate to recreational mathematics. Here is a selection of such pages:

- Aliquot Chains
- Amicable Numbers
- Armstrong Numbers
- Benjamin Franklin's Magic Square
- Birthdays
- Calculating the Date of Easter
- Chaos Theory and Iterative Systems
- Chess and Mathematics
- Combinatorial Games
- Conway's Game of Life
- Digital Roots
- The Disadvantages of Being Absent-minded
- Dissection Puzzles
- Egyptian Fractions
- Eight Queens Puzzle
- Einstein's Riddle
- The Fibonacci Sequence
- Four 4s Puzzle
- Fractals
- The Golden Ratio
- Guess My Number
- Knight's Tour
- Knight's Tour Magic Square
- Königsberg Bridges
- Lateral Thinking Puzzles
- Loops
- Magic Squares
- A Mathematical Easter Egg
- Monty Hall Problem
- Nim
- Pascal's Triangle
- Pascal's Triangle Art
- Peg Solitaire
- Recreational Logic
- Russian Peasant Multiplication
- St. Ives Riddle
- Sociable Numbers
- The Spider and the Fly
- Trading Post