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2. Missing square puzzle - Wikipedia

   en.wikipedia.org/wiki/Missing_square_puzzle

   The missing square puzzle is an optical illusion used in mathematics classes to help students reason about geometrical figures; or rather to teach them not to reason using figures, but to use only textual descriptions and the axioms of geometry. It depicts two arrangements made of similar shapes in slightly different configurations.

3. Wheat and chessboard problem - Wikipedia

   en.wikipedia.org/wiki/Wheat_and_chessboard_problem

   The problem may be solved using simple addition. With 64 squares on a chessboard, if the number of grains doubles on successive squares, then the sum of grains on all 64 squares is: 1 + 2 + 4 + 8 + ... and so forth for the 64 squares. The total number of grains can be shown to be 2 64 −1 or 18,446,744,073,709,551,615 (eighteen quintillion ...

4. Trachtenberg system - Wikipedia

   en.wikipedia.org/wiki/Trachtenberg_system

   Trachtenberg system. The Trachtenberg system is a system of rapid mental calculation. The system consists of a number of readily memorized operations that allow one to perform arithmetic computations very quickly. It was developed by the Russian engineer Jakow Trachtenberg in order to keep his mind occupied while being in a Nazi concentration camp.

5. 30 Math Puzzles (with Answers) to Test Your Smarts - AOL

   www.aol.com/30-math-puzzles-answers-test...

   Who says math can't be fun?! These math puzzles with answers are a delightful challenge. The post 30 Math Puzzles (with Answers) to Test Your Smarts appeared first on Reader's Digest.

6. Texas Math and Science Coaches Association - Wikipedia

   en.wikipedia.org/wiki/Texas_Math_and_Science...

   Calculations can be done with a certain trick or shortcut that makes them feasible mentally. [1] Additionally, no scratch work or paper calculations are allowed and almost everything has to be done mentally. All correct problems are awarded and for every problem wrong or skipped before the last problem attempted 4 points are deducted.

7. List of Martin Gardner Mathematical Games columns - Wikipedia

   en.wikipedia.org/wiki/List_of_Martin_Gardner...

   An array of problems that can be solved with elementary mathematical techniques 1967 Apr: The amazing feats of professional mental calculators, and some tricks of the trade 1967 May: Cube-root extraction and the calendar trick, or how to cheat in mathematics 1967 Jun: The polyhex and the polyabolo, polygonal jigsaw puzzle pieces 1967 Jul