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2. 85 brainteasers for kids (and their answers) to battle boredom

   www.aol.com/news/60-brainteasers-kids-answers...

   What can you put between 4 and 5 so that the result is more than 4, but less than 5? A decimal. Use the numbers 2, 3, 4 and 5, as well as the symbols + and = to make a true math equation. 2 + 5 ...

3. Treasure Mountain! - Wikipedia

   en.wikipedia.org/wiki/Treasure_Mountain!

   In 1997 an updated version of the game was released on CD-ROM (version 2.0 Mac/2.01 Win) with even better graphics. Treasure Mountain! was later released in a software bundle package with both Treasure Cove! and Treasure Galaxy! under the name Treasure Trio!. This was one of the first software bundle packages ever sold. [6]

4. List of impossible puzzles - Wikipedia

   en.wikipedia.org/wiki/List_of_impossible_puzzles

   [5] Seven Bridges of Königsberg – Walk through a city while crossing each of seven bridges exactly once. [6] Squaring the circle, the impossible problem of constructing a square with the same area as a given circle, using only a compass and straightedge. [7]

5. Recreational mathematics - Wikipedia

   en.wikipedia.org/wiki/Recreational_mathematics

   Some of the more well-known topics in recreational mathematics are Rubik's Cubes, magic squares, fractals, logic puzzles and mathematical chess problems, but this area of mathematics includes the aesthetics and culture of mathematics, peculiar or amusing stories and coincidences about mathematics, and the personal lives of mathematicians.

6. Monty Hall problem - Wikipedia

   en.wikipedia.org/wiki/Monty_Hall_problem

   The game host then opens one of the other doors, say 3, to reveal a goat and offers to let the player switch from door 1 to door 2. The Monty Hall problem is a brain teaser , in the form of a probability puzzle, based nominally on the American television game show Let's Make a Deal and named after its original host, Monty Hall .

7. Puzzle - Wikipedia

   en.wikipedia.org/wiki/Puzzle

   The nine linked-rings puzzle, an advanced puzzle device that requires mathematical calculation to solve, was invented in China during the Warring States period (475-221 BCE). [5] Jigsaw puzzles were invented around 1760, when John Spilsbury , a British engraver and cartographer , mounted a map on a sheet of wood, which he then sawed around the ...