Jan van Koningsveld (born 1969 in

Emden Emden () is an independent city and seaport in Lower Saxony in the northwest of Germany, on the river Ems. It is the main city of the region of East Frisia and, in 2011, had a total population of 51,528. History The exact founding date of ...

) is a mental calculator. He is the champion of Extracting Square Roots of 2004 and 2008 as well as the champion of Calendar Calculation of 2008 at the Mental Calculation World Cups. In addition, he finished second in the overall rankings of 2004, 2006 and 2008. During the first Memoriad 2008, the Olympiad for Mental Calculation and Memory held in

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, Turkey, Jan van Koningsveld won the gold medals in the categories Multiplication as well as Calendar Calculation.Memoriad 2008
/ref> After the competition he was also able to even the world record in the category Calendar Calculation by calculating 56 days of the week (range 1600–2100) in 1 minute. Jan van Koningsveld also held the world record for multiplying two five-digit numbers. He solved ten tasks correctly in 3:06 minutes on 25 November 2005. That record was broken by Marc Jornet Sanz during world record attempts at the 2010 Mental Calculation World Cup

References

External links

* http://memoriad.com/ MEMORIAD * http://www.recordholders.org/en/list/memory.html Memory and Mental Calculation World Records * http://www.recordholders.org/en/events/worldcup/index.html Mental Calculation World Cup Site {{DEFAULTSORT:Koningsveld, Jan van 1969 births Living people Mental calculators People from Emden