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Mental calculation
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====World Cup==== The [[Mental Calculation World Cup]] is an international competition that attempts to find the world's best mental calculator, and also the best at specific types of mental calculation, such as addition, multiplication, square root or calendar reckoning. The first Mental Calculation World Cup <ref name=MCWC>{{Cite web|url=http://www.recordholders.org/en/events/worldcup/|title=Mental Calculation World Cup - the World Championship for Mental Calculators|website=www.recordholders.org}}</ref> took place in 2004. It is an in-person competition that occurs every other year in Germany. It consists of four different standard tasks --- addition of ten ten-digit numbers, multiplication of two eight-digit numbers, calculation of square roots, and calculation of weekdays for given dates --- in addition to a variety of "surprise" tasks.<ref name=MCWC/> The last edition was organized in September 2024 and won by [[Aaryan Nitin Shukla]], who successfully defended his title to become two time World Champion.
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