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2. 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]

3. Barbara Reys - Wikipedia

   en.wikipedia.org/wiki/Barbara_Reys

   Barbara Jean Bestgen Reys (born 1953) [1] is an American mathematics educator known for her research in number sense and mental calculation, for her mathematics textbooks, and for her leadership in developing curriculum standards for elementary school mathematics education. [2]

4. Saxon math - Wikipedia

   en.wikipedia.org/wiki/Saxon_math

   The Saxon Math 1 to Algebra 1/2 (the equivalent of a Pre-Algebra book) curriculum [3] is designed so that students complete assorted mental math problems, learn a new mathematical concept, practice problems relating to that lesson, and solve a variety of problems. Daily practice problems include relevant questions from the current day's lesson ...

5. Mental abacus - Wikipedia

   en.wikipedia.org/wiki/Mental_abacus

   Mental calculation is said to improve mental capability, increases speed of response, memory power, and concentration power. Many veteran and prolific abacus users in China, Japan, South Korea, and others who use the abacus daily, naturally tend to not use the abacus any more, but perform calculations by visualizing the abacus.

6. Trachtenberg system - Wikipedia

   en.wikipedia.org/wiki/Trachtenberg_system

   Take half of the neighbor, then, if the current digit is odd, add 5. Example: 42×5=210 Half of 2's neighbor, the trailing zero, is 0. Half of 4's neighbor is 1. Half of the leading zero's neighbor is 2. 43×5 = 215 Half of 3's neighbor is 0, plus 5 because 3 is odd, is 5. Half of 4's neighbor is 1. Half of the leading zero's neighbor is 2. 93 ...

7. Scott Flansburg - Wikipedia

   en.wikipedia.org/wiki/Scott_Flansburg

   Scott Flansburg (born December 28, 1963) is an American dubbed "The Human Calculator" and listed in the Guinness Book of World Records for speed of mental calculation. He is the annual host and ambassador for The National Counting Bee, a math educator, and media personality. He has published the books Math Magic and Math Magic for Your Kids. [1]