Math Humor

• Andrej and Elena Cherkaev's Math Jokes
• Math Jokes  (via Germany)
• Math Jokes (via England)
• Maths Jokes (via England)
• Mathematician Jokes

Math Fun 

• Andrej and Elena Cherkaev's Math Puzzles
• Math.com Puzzles and Games
• Mathpuzzle
• Math Fun and Games
• Mathsnet Games and Puzzles