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2. Krypto (game) - Wikipedia

   en.wikipedia.org/wiki/Krypto_(game)

   A spread of Krypto cards: players must find a way to calculate 12 using the numbers 5, 19, 8, 3 and 6. Krypto is a card game designed by Daniel Yovich in 1963 and published by Parker Brothers and MPH Games Co. [1] It is a mathematical game that promotes proficiency with basic arithmetic operations.

3. Mental calculation - Wikipedia

   en.wikipedia.org/wiki/Mental_calculation

   It has been shown that during high levels of physical activity there is a negative effect on mental task performance. [5] This means that too much physical work can decrease accuracy and output of mental math calculations. Physiological measures, specifically EEG, have been shown to be useful in indicating mental workload. [6]

4. Mental abacus - Wikipedia

   en.wikipedia.org/wiki/Mental_abacus

   This was verified when the right brain of visualisers showed heightened EEG activity when calculating, compared with others using an actual abacus to perform calculations. The abacus can be used routinely to perform addition, subtraction, multiplication, and division; it can also be used to extract square and cube [ 4 ] roots.

5. Trachtenberg system - Wikipedia

   en.wikipedia.org/wiki/Trachtenberg_system

   Some of the algorithms Trachtenberg developed are ones for general multiplication, division and addition. Also, the Trachtenberg system includes some specialised methods for multiplying small numbers between 5 and 13. The section on addition demonstrates an effective method of checking calculations that can also be applied to multiplication.

6. 24 (puzzle) - Wikipedia

   en.wikipedia.org/wiki/24_(puzzle)

   The original version of 24 is played with an ordinary deck of playing cards with all the face cards removed. The aces are taken to have the value 1 and the basic game proceeds by having 4 cards dealt and the first player that can achieve the number 24 exactly using only allowed operations (addition, subtraction, multiplication, division, and parentheses) wins the hand.

7. Keira Knightley Reveals the Unusual Reason She Doesn’t Want ...

   www.aol.com/keira-knightley-reveals-unusual...

   Keira Knightley’s number one reason for having no more kids isn’t the pain of childbirth or the endless nights of disrupted sleep.. On Monday, Dec. 9. the actress, 39, gushed about her two ...