Listed below are the verified claims for the record listed.
Mental Calculation, Addition - Current world record
1.
Jeonghee Lee (South Korea) solved ten mental calculation tasks of the type "add ten 10-digit numbers" without an error in 1:40 minutes
on 31 July 2014 at Dwight Morrow High School in Englewood, New Jersey (USA).
Previous verified claims
1.
The record for mental addition was broken no less then three times during the Memoriad 2012 at Belconti Resort Hotel in Antalya (Turkey).
First, on 23 November 2012, Akshita Shailesh Shah (India) solved ten mental calculation tasks of the type "add ten 10-digit numbers" without an error
in 3:06.9 minutes. A little later, Granth Rakesh Thakkar (India) needed only 3:06.3 minutes for another set of 10 random tasks.
Finally, on 24 November 2012 Naofumi Ogasawara (Japan) solved ten problems in 2:51.1 minutes.
2.
Naofumi Ogasawara (Japan) solved ten mental calculation tasks of the type "add ten 10-digit numbers" without an error in
at the Mental Calculation World Cup 2012 on 30 September 2012 in Gießen, Germany.
3.
Marc Jornet Sanz (Spain) solved ten mental calculation tasks of the type "add ten 10-digit numbers" without an error in 3:19.42 minutes on 23 September 2010 at the
Mathematics Faculty of the University of Valencia, Spain.
4.
Alberto Coto (Spain) solved ten mental calculation tasks of the type "add ten 10-digit numbers" without an error in 3:42 minutes
at the Mental Calculation World Cup 2010 on 7 June 2010 in Magdeburg, Germany.
5.
Ramon Abella Villa (Spain) solved ten mental calculation tasks of the type "add ten 10-digit numbers" without an error in 4:02.9 minutes
at the Impossibility Challenger Games on 21 June 2009 in Dachau, Germany.
6.
Alberto Coto (Spain) solved ten mental calculation tasks of the type "add ten 10-digit numbers" without an error in 4:26 minutes
at the Mental Calculation World Cup 2008 on 1 July 2008 in Leipzig, Germany.
The Book of Alternative records - World records, record breakers and more!
