Memory and Mental Calculation World Records
Comments? Corrections? New Records? Please contact us at [email protected]
|
|
Links:
Memory Books,
International
Association of Memory,
Memoriad,
Mental
Calculation World Cup,
Memory
Sports Database at memo-camp,
World
Memory Statistics (World Memory Sports Council),
Mind Sports Olympiad,
Mental Calculation Mailing List,
Mnemonics,
Memo Camp
Books:
Learn to
Remember by Dominic O'Brien, record holder in a
lot of memory categories
ORDER
from amazon.com
from the UK:
ORDER
from amazon.co.uk
 Memory Pack by Andi Bell, another memory
record breaker
ORDER
from amazon.com
from the UK:
ORDER
from amazon.co.uk
MORE BOOKS...
|
Memorising Pi
| digits |
record holder |
year |
Pi and Pi Memory Links:
www.pi-world-ranking-list.com
The world ranking list for
memorising Pi
worldpifederation.org
World Pi Federation
Pi Links
great link page
Pi
Dictate
an iPhone app for training Pi memory
(using speech recognition)
Books about Pi:
A book about Pi record breaker Rajan
Mahadevan: Memory
Search By A Memorist
...and if you have read enough about Pi
consider this book:
e:
The
Story
of
a
Number
|
| 511 |
David Richard Spencer (Canada) |
? |
| 930 |
Nigel Hodges (Great Britain) |
1973 |
1,111
|
Fred Graham (Canada)
|
1973
|
| 1,210 |
Timothy Pearson (Great Britain) |
1973 |
| 1,505 |
Edward C. Berberich (USA) |
1974 |
| 3,025 |
Michael John Poultney (Great Britain) |
1974 |
| 4,096 |
Simon Plouffe (Canada) |
1975 |
| 5,050 |
Michael John Poultney (Great Britain) |
1977 |
| 6,350 |
David Sanker (USA) |
1978 |
| 10,000 |
David Sanker (USA) |
1978 |
| 10,625 |
David Fiore (USA) |
1979 |
| 11,944 |
Hans Eberstark (Austria) |
1979 |
| 15,151 |
Hideaki Tomoyori (Japan) |
1979 |
| 15,186 |
Creighton
Carvello (Great Britain) |
1979 |
| 20,000 |
Hideaki Tomoyori (Japan) |
1979 |
| 20,013 |
Creighton
Carvello (Great Britain) |
1980 |
| 31,811 |
Rajan
Mahadevan (India) |
1985 |
| 40,000 |
Hideaki Tomoyori (Japan) |
1987 |
| 42,195 |
Hiroyuki Goto (Japan) |
1995 |
67,890
|
Chao Lu (China)
|
2005
|
70,000
|
Rajveer Meena (India)
|
2015
|
|
New record claims (not yet confirmed): Akira Haraguchi
(Japan): 83,431 on 1 July 2005 and 100,000 on 4 October 2006
Suresh Kumar Sharma (India) 70,030 on 21 October 2015
In 1998, Yip Swe
Chooi (Malaysia) recited 60,000 digits of Pi with only 44
errors. Sim Pohann (Malaysia) recited 67,053 digits with only 15
errors on 14 April 1999.
Two more special records for memorising Pi can be found here.
Memorising Random Numbers
Most Digits Memorised in 2 / in 4
Seconds
See extra
page with details about this record
Most Binary Digits Memorised in 3
Seconds
See extra
page with details about this record
Most Binary Digits Memorised in One
Minute
Note: The records with the "light bulb" icon were
achieved using light bulbs (on or off) which makes the record
more difficult.
On several occasions, the record for 5 minutes (see below)
was superior to the record for one minute, so in fact the record
holder for 5 minutes should be regarded as the record holder for
one minute as well. Itay Avigdor's record has been set in front
of witnesses, but not at a location open to the general public.
New record reported (not yet confirmed): 264 by Jayashimha
Ravirala (India) and 270 by Aravind Pasupathy
(India)
National
records not mentioned in the above table:
Indonesia: 216, Dominic Brian
Hindarto, 2010
India: 132, Nischal Narayanam,
2009
China: 100 (in 42.7 seconds),
Jia Xiaoxia, 2009 
Most Binary Digits Memorised in 5
Minutes
Spoken Numbers (Spoken at a
Rate Of One Digit Every Second)
Spoken Numbers (Spoken at a
Rate Of One Digit Every 2 Seconds)
Three attempts: The first one with 100 numbers, the second one
with 200 numbers and the third one with 400 numbers (event now
discontinued)
Memorising Numbers, Flashing one
Digit per Seconds on a Screen
| 259 |
Jonas von Essen (Sweden)
|
2012 |
486
|
Tsogbadrakh Saikhanbayar (Mongolia) |
2016 |
Memorisation of Written Numbers (1
Minute)
no errors allowed
Memorisation of Written Numbers (100
Digits)
no errors allowed
Memorisation of Written Numbers (5
Minutes)
Contestants recall the number by writing it down. No mistake in
each line of 40 digits scores 40 points. However, one mistake
reduces the score for that row to 20, the second mistake reduces
the score for that row to zero.
Memorisation of Written Numbers
(15 Minutes)
Contestants recall the number by writing it down. No mistake in
each line of 40 digits scores 40 points. However, one mistake
reduces the score for that row to 20, the second mistake reduces
the score for that row to zero.
Jan Formann (Denmark)
memorised 760 digits at the Memory World Cup 2004. The rules at
this event were slightly different from other memory contests.
Memorisation of Written Numbers
(30 Minutes)
Random numbers are presented in rows of 40 digits. Scoring is
tabulated by row: one point for each digit. However, one mistake
reduces the score for that row to 20, the second mistake reduces
the score for that row to zero.
Memorisation of Written Numbers (1
Hour)
Random numbers are presented in 25 rows of 40 digits. Scoring is
tabulated by row: one point for each digit. However, one mistake
reduces the score for that row to 20, the second mistake reduces
the score for that row to zero.
Memorisation of Binary Numbers (30
Minutes)
Random binary numbers are presented in rows of 30 digits. Scoring
is tabulated by row: one point for each digit. However, one
mistake reduces the score for that row to 20, the second mistake
reduces the score for that row to zero.
Memorising Words / Text
The most impressive feat for learning words - memorising 23200
words within 72 hours - was reported by Ramón Campayo
(Spain). Unfortunately, there is no written documentation
about his records, so that they cannot be regarded as "official"
records for this list.
Memorisation of previously unpublished text
(15 Minutes)
(This category is no more held at memory contests.)
| 345 points |
Astrid Plessl (Austria)
|
2003 |
Memorisation of Random Words (5 Minutes)
80
|
Cornelia Beddies (Germany)
|
2006
|
109
|
Katie Kermode (Great Britain)
|
2009
|
119
|
Boris-Nikolai Konrad
(Germany) |
2013
|
124
|
Simon Reinhard (Germany)
Johannes Mallow (Germany)
|
2013
2015
|
125
|
Simon Reinhard (Germany) |
2015
|
134
|
Simon Reinhard (Germany) |
2016
|
140
|
Johannes
Mallow (Germany) |
2017
|
145
|
Yanjaa Wintersoul (Mongolia)
|
2018
|
Memorisation of Random Words (15 Minutes)
Random words are presented in columns of 25 words. Scoring is
tabulated by column: one point for each word. However, one mistake
reduces the score for that column by half, the second mistake
reduces the score for that column to zero.
Memorising Playing Cards
Most cards memorised (inter-shuffled
packs)
The record is for the greatest number of packs of 52 cards all
shuffled together, memorised and recalled. The contestant is
allowed to view the cards once only.
Rules:
Two independent witnesses/invigilators, persons of some standing
in the community, must be present during the entire attempt. If a
wrong card is called and this is corrected immediately and
spontaneously without prompting then this would not count as an
error. The maximum number of errors acceptable is half of one
percent of the total number of cards involved, rounded up to the
nearest whole number.
The time taken to memorise the cards and to recall them should be
recorded but are not essential requirements of the record.
| Packs |
Cards |
Record Holder |
Year |
Errors |
| 30 |
1560 |
George Uhrin (USA) |
1989 |
2 |
| 35 |
1820 |
Dominic O'Brien (Great Britain) |
1990 |
2 |
| 36 |
1872 |
Frost McKee (USA) |
1992 |
8 |
| 40 |
2080 |
Dominic O'Brien (Great Britain) |
1993 |
1 |
| 52 |
2704 |
David
Farrow (Canada) |
1996 |
6 |
| 54 |
2808 |
Dominic O'Brien (Great Britain) |
2002 |
8 |
59
|
3068
|
David
Farrow (Canada) |
2007
|
1
|
|
The story behind this
record - written by Dominic O'Brien - can be read HERE. |
10 Minutes Memorisation of Several
Packs of Cards
Contestants are given 10 minutes to memorise as many of 12 packs
of cards (52 cards each) as they can. No mistakes in a pack of
cards scores 52 points, one mistake scores 26 points and more than
one mistake scores zero points.
(c) achieved in a competition using computers instead of actual
playing cards
30 Minutes Memorisation of Several
Packs of Cards
1 Hour Memorisation of Several Packs of
Cards
Contestants are given one hour to memorise as many of 12 packs of
cards (52 cards each) as they can. No mistakes in a pack of cards
scores 52 points, one mistake scores 26 points and more than one
mistake scores zero points.
Speed Record : A Single Pack ("Speed
Cards")
The record is for the fastest time to memorise a single pack of
52 shuffled playing cards with no errors.
Using the Memoriad software, Alexander Mullen memorised a deck of
cards in 17.69 seconds at the Memoriad 2016 in Las Vegas.
Speed Record two decks
The basic rules are the same one as for one deck. Each pack
should be shuffled seperatly, the decks should NOT be mixed. In
every step, two cards together should be turned - one from the
first deck, the second one from the other deck. Everytime the
contestants can see two cards.
The records
| 3:37 min |
Dominic O'Brien (Great Britain) |
2001 |
Memorising Names and Faces (5 Minutes)
Faces are presented to the contestants in a certain order with
corresponding names underneath. They are then presented in a new
order without names. Contestants mark names on new sheets. One
point is awarded for each correct forename, one point for each
surname.
NOTE: The records up to 2015 were achieved in contests where only
typical "national" names have to be memorised.
Memorising Names and Faces (15 Minutes)
Faces are presented to the contestants in a certain order with
corresponding names underneath. They are then presented in a new
order without names. Contestants mark names on new sheets. One
point is awarded for each correct forename, one point for each
surname.
Note: The record for international names and faces - the
category that is now used in memory competitions - is 200 points
by Katie Kermode (UK).
Memorising (Fictional) Historic Dates (5
minutes)
Memorising Abstract Images (15 minutes)
Playing Games From Memory While Blindfolded
Chess
Claims in this category have been put into doubt by rumours that
the master had the games written down, or that large number of
opponents agreed to resign after a few nominal moves, for example.
The following table contains the record that were accepted by the
chess community.
A wealth of information about blindfold chess can be found in the
book "Blindfold
Chess" by Eliot Hearst und John Knot and the web site www.blindfoldchess.net.
| games |
player |
year |
result |
1
1 |
Sa'id Bin Jubair
Josef Tchelebi (Greece) |
~690
970 |
|
| 2 |
Buzzecca (Saracen)
|
1265 |
|
3
3
3
3
3
3 |
Al-Jami
Giovanni Girolamo Saccheri (Genoa)
Francois André Danican Philidor (France)
Lionel Kiesertzky (France)
William Lewis (Great Britain)
Louis Charles de la Bourdonnais (France) |
1331
1667
1783
1846
|
|
4
4
|
Lionel Kiesertzky (France)
Louis Paulsen (Germany) |
1851
1857 |
+3=0-1
+2=1-1
|
| 5 |
Louis Paulsen (Germany) |
1857 |
+4=1-0 |
7
|
Louis Paulsen (Germany) |
1858
|
7=0-0 |
| 8 |
Louis Paulsen (Germany) |
1858 |
|
| 10 |
Louis Paulsen (Germany) |
1858 |
+9=1-0 |
15
15 |
Louis Paulsen (Germany) (disputed)
Joseph Blackburne (Great Britain) |
1859
1876 |
|
16
16
|
Johannes Hermann Zukertort (Poland)
Harry Nelson Pillsbury (USA)
|
1876
1900
|
+12=3-1
+11=4-1 |
17
|
Harry Nelson Pillsbury (USA) |
1900
|
+10=5-2 |
| 20 |
Harry Nelson Pillsbury (USA) |
1897 |
+14=5-1 |
| 21 |
Harry Nelson Pillsbury (USA) |
1902 |
+3=11-7
(very strong opponents) |
| 22 |
Harry Nelson Pillsbury (USA) |
1902 |
+17=4-1 |
| 24 |
Richard Réti (Czechoslovakia) |
1919 |
+12=9-3 |
| 25 |
Gyula Breyer (Hungary) |
1921 |
+15=7-3 |
| 26 |
Alexander Alekhine (France) |
1924 |
+16=5-5
(very strong opponents)
|
| 28 |
Alexander Alekhine (France) |
1925 |
+22=3-3 |
| 29 |
Richard Réti (Czechoslovakia) |
1925 |
+20=7-2 |
| 30 |
George Koltanowski (Belgium) |
1931 |
+20=10-0 |
| 32 |
Alexander Alekhine (France) |
1933 |
+19-9=4 |
| 34 |
George Koltanowski (Belgium) |
1937 |
+24=10-0 |
| 40 |
Miguel Najdorf (Argentina) |
1943 |
+36=1-3 |
| 45 |
Miguel Najdorf (Argentina) |
1947 |
+39=4-2 |
46
|
Marc Lang (Germany) DETAILS |
2011
|
+25=19-2 |
Draughts
| games |
player |
year |
result |
2
|
Ben Springer (Netherlands)
|
1926
|
+1=1-0
|
5
|
Piet Roozenburg (Netherlands)
|
1950
|
|
| 8 |
Wim Huisman (Netherlands) |
1955 |
+5=1-2 |
| 10 |
Ton Sijbrands (Netherlands) |
1982 |
+9=1-1 |
| 12 |
Ton Sijbrands (Netherlands) |
1986 |
+11=1-0 |
| 14 |
Ton Sijbrands (Netherlands) |
1987 |
+12=1-1 |
| 15 |
Ton Sijbrands (Netherlands) |
1991 |
+13=2-0 |
| 18 |
Ton Sijbrands (Netherlands) |
1993 |
+14=4-0 |
| 20 |
Ton Sijbrands (Netherlands) |
1999 |
+17=3-0 |
22
|
Ton Sijbrands (Netherlands) |
2002
|
+17=5-0
|
24
|
Ton Sijbrands (Netherlands) VIDEO
|
2004
|
+20=4-0 |
25
|
Ton Sijbrands (Netherlands) |
2007
|
+21=4-0 |
27
|
Erno Prosman (Niederlande) |
2008
|
+15=8-4
|
28
|
Ton Sijbrands (Netherlands)
|
2009
|
+18=7-3
|
30
|
Erno Prosman (Niederlande) VIDEO
|
2012
|
+17=8-5
|
32
|
Ton Sijbrands (Netherlands) VIDEO
|
2014
|
+14=8-0
|
In 1947, Newell W. Banks (USA) played blindfold for 4 hr per day
for 45 consecutive days, winning 1331 games, drawing 54 and
losting only two, while playing six games at a time.
Rubik's Cube
see extra page with
details about this record
Mental Calculation: Addition
Addition of 100 single-digit
numbers
Rules:
The general rules for
calculating records apply.
- This record is for the fastest time for an individual to add
together 100 single-digit numbers.
- The record is a test of straightforward mental calculation.
The calculator should perform the calculation in his/her head
without the aid of any other person and without using a
calculating machines, computers, etc. nor may the calculator
write the numbers down.
- The 100 numbers (0-9) to be added together should be randomly
selected by computer immediately prior to the calculation and
should be displayed to the calculator on a computer screen,
board, screen or similar. The numbers should ideally be
presented on the screen in rows of, for example, five or ten
digits.
- The calculator must see all the numbers simultaneously -
numbers may not appear one after another on a screen etc. for
the calculator.
- The calculator should write down the answer to the
calculation.
- The timing begins when the 100 numbers become visible to the
competitor and ends at the end of writing the answer.
- In some cases, the calculator may dictate the answer - then
the timing ends as the calculator finishes dictating the answer.
- Two stopwatches should be used: it would be appreciated these
stopwatches record in minutes and seconds and tenths of a second
rather than hundredths of an hour. At the end of the attempt the
time should be taken as an average of the two watches.
| 32.57 s |
R. H. Frost (Great Britain) |
1977 |
| 19.23 s |
Alberto Coto (Spain) |
1999 |
14.71 s*
|
Ramon Abella Villa (Spain) |
2019
|
The result by Ramon
Abella Villa was the average of three consecutive correct
calculations (completed in 14.97 sec, 14.88 sec and 14.28 sec).
Addition of ten 10-digit
numbers
(10 tasks for adding ten 10-digit numbers correctly)
The general rules for
calculating records apply.
| Alberto Coto (Spain) |
5:50 min
|
30 October 2004 at the Mental Calculation
World Cup in Annaberg-Buchholz (Germany) |
Jorge Arturo Mendoza Huertas
(Peru)
|
5:36 min
|
27 April 2005 at the National
University Peru
|
| Alberto Coto (Spain) |
4:35 min
|
1 July 2008 at the Mental Calculation
World Cup at the University of Leipzig (Germany)
|
| Alberto Coto (Spain) |
4:26 min
|
1 July 2008 at the Mental Calculation
World Cup at the University of Leipzig (Germany) |
Ramon Abella Villa (Spain)
|
4:22.6 min
|
21 June 2009 at the
Impossibility Challenger Games in Dachau (Germany)
|
| Ramon Abella Villa (Spain) |
4:02.9 min
|
21 June 2009 at the
Impossibility Challenger Games in Dachau (Germany) |
| Alberto Coto (Spain) |
3:42 min
|
6 June 2010 at the Mental Calculation
World Cup in Magdeburg (Germany)
|
Marc Jornet Sanz (Spain)
|
3:19.4 min
|
23 September 2010 at the
Mathematics Faculty of the University of Valencia (Spain)
|
| Naofumi Ogasawara (Japan) |
3:11 min
|
30 September 2012 at the Mental Calculation
World Cup in Gießen (Germany)
|
Akshita Shailesh Shah (India)
|
3:06.9 min
|
23 November 2012 at the Memoriad
2012 at Belconti Resort Hotel in Antalya (Turkey)
|
Granth Rakesh Thakkar (India)
|
3:06.3 min
|
23 November 2012 at the Memoriad
2012 at Belconti Resort Hotel in Antalya (Turkey) |
| Naofumi Ogasawara (Japan) |
2:51.1 min
|
24 November 2012 at the Memoriad
2012 at Belconti Resort Hotel in Antalya (Turkey) |
Jeonghee Lee (South Korea)
|
1:40 min
|
31 July 2014 at Dwight Morrow High School in
Englewood, New Jersey (USA)
|
Aaryan Shukla (India)
|
1:36.3 min
|
14 September 2024 at the Mental Calculation
World Cup in Paderborn (Germany) |
Swanand Bhore (India)
|
1:28.4 min
|
15 September 2024 at the Mental Calculation
World Cup in Paderborn (Germany) |
| Aaryan Shukla (India) |
1:18.0 min
|
15 September 2024 at the Mental Calculation
World Cup in Paderborn (Germany) |
There is also a detailed statistics page with the world rankings and
national records.
Mental Calculation:
Multiplication
Johann Martin Zacharias Dase (Germany, 1824-1861)
multiplied two 20 digit numbers in 6 minutes and two 100
digit numbers in 8 3/4 hous in 1861.
He also multiplied two 8 digit numbers in 54 seconds.
These records are historically accepted, although they
were not achieved under modern rules.
In 1980, Shakuntala
Devi (India) was reported to have multiplied two
13-digit numbers in 28 sec. This record was accepted by
the Guinness Book of Records, but later they added the
comment "Some experts on calculating prodigies refuse to
give credence to the above - largely on the grounds that
it is so vastly superior to the calculating feats of any
other invigilated prodigy."
The Limca Book of Records (India) accepts this record as
well as "Buzan's Book of Mental Records" which comments:
"We respectfully point out that Mrs Devi has been
invigilated at a number of times, has appeared on numerous
live television shows, performing 'new' calculations based
on the works of various mathematics professors, and has
consistently performed at the level indicated in her
record-breaking performance. We support Mrs Devi in her
natural excellence, and hope that researchers will
increasingly realise that their amazement and amusement
should lie not in the outstanding excellence of any human
mental performance, but in the rarity of similar
performances."
Note: One of the factors she had to multiply ended in
0, so that in fact she multiplied a 12 digit number with
a 13 digit number.
Multiplication of two 5- or 8-digit
Numbers
Rules:
The general rules for
calculating records apply.
- This record is for the fastest time for an individual
to multiply two five-digit / eight-digit numbers.
- Ten tasks have to be solved without a single error.
The clock does not stops between the taske.
- The record is a test of straightforward mental
calculation. The calculator should perform the
calculation in his/her head without the aid of any other
person and without using a calculating machines,
computers, etc. nor may the calculator write the numbers
down.
- The numbers to be multiplied together should be
randomly selected by computer immediately prior to the
calculation and should be displayed to the calculator on
a computer screen, board, screen or similar.
- The calculator should write down the answer to the
calculation. If the answer is written down, this can be
done left-to-right, right-to-left or in any arbitrary
order.
- The timing begins when the two numbers become visible
to the competitor and ends at the end of writing the
answer.
- In some cases, the calculator may dictate the answer -
then the timing ends as the calculator finishes
dictating the answer.
- Two stop watches should be used: it would be
appreciated these stopwatches record in minutes and
seconds and tenths of a second rather than hundredths of
an hour. At the end of the attempt the time should be
taken as an average of the two watches.
world records: five-digit numbers
|
| Jan van Koningsveld
(Germany) |
3:06 minutes
|
25 November 2005 at
Berufsbildenden Schule I in Emden (Germany)
|
| Marc Jornet Sanz
(Spain) |
1:42 minutes
|
5 June 2010 at the Mental
Calculation World Cup in Magdeburg (Germany)
|
| Marc Jornet Sanz
(Spain) |
1:16 minutes
|
23 September 2010 at
the Mathematics Faculty of the University of
Valencia (Spain) |
| Marc Jornet Sanz (Spain) |
1:10.8 minutes
|
30 August 2018 at the Institute of
Multidisciplinary Mathematics of the Polytechnic
University of Valencia (Spain) |
| Marc Jornet Sanz (Spain) |
1:10.6 minutes
|
30 August 2018 at the Institute of
Multidisciplinary Mathematics of the Polytechnic
University of Valencia (Spain) |
| Marc Jornet Sanz (Spain) |
1:09.0 minutes
|
31 August 2018 at the Institute of
Multidisciplinary Mathematics of the Polytechnic
University of Valencia (Spain) |
| Marc Jornet Sanz (Spain) |
1:06.2 minutes
|
22 January 2019 at school CEIP Padre
Moreno in Moixent (Spain) |
| Marc Jornet Sanz (Spain) |
1:04.4 minutes
|
23 January 2019 at school CEIP Padre
Moreno in Moixent (Spain) |
| Marc Jornet Sanz (Spain) |
1:01.6 minutes
|
23 January 2019 at school CEIP Padre
Moreno in Moixent (Spain) |
| Marc Jornet Sanz (Spain) |
0:59.4 minutes
|
24 January 2019 at school CEIP Padre
Moreno in Moixent (Spain) |
Aaryan Shukla (India)
|
0:56.7 minutes
|
16 July 2022 at the Mental
Calculation World Cup in Paderborn (Germany)
|
| world records: eight-digit numbers |
| Mohammed Seghir Saïd
(Algeria) |
13:00 minutes
|
6 March 2006 at youth
hostel Tizi-Ouzou |
| Alberto Coto
(Spain) |
11:44 minutes
|
1 July 2008 at
the Mental
Calculation World Cup in Leipzig (Germany)
|
| Alberto Coto
(Spain) |
8:25 minutes
|
1 July 2008 2008 at
the Mental
Calculation World Cup in Leipzig (Germany)
|
Marc Jornet Sanz
(Spain)
|
4:56 minutes
|
6 June 2010 at
the Mental
Calculation World Cup in Magdeburg (Germany)
|
| Marc Jornet Sanz
(Spain) |
4:29.3 minutes
|
7 June 2010 at
the Mental
Calculation World Cup in Magdeburg (Germany)
|
Freddis Reyes Hernández (Cuba)
|
4:28.8 minutes
|
23 November 2012 at the Memoriad
2012 at Belconti Resort Hotel in Antalya
(Turkey) |
| Freddis Reyes Hernández (Cuba) |
3:54.1 minutes
|
23 November 2012 at the Memoriad
2012 at Belconti Resort Hotel in Antalya
(Turkey) |
| Freddis Reyes Hernández (Cuba) |
3.30.6 minutes
|
6 February 2015 at Kulturbunker in
Emden (Germany)
|
| Jeonghee Lee (South Korea) |
3:17.4 minutes
|
9 November 2016 at the Golden Nugget
Hotel in Las Vegas
|
| Marc Jornet Sanz (Spain) |
3:09.4 minutes
|
31 August 2018 at the Institute of
Multidisciplinary Mathematics of the Polytechnic
University of Valencia (Spain) |
| Marc Jornet Sanz (Spain) |
3:06.8 minutes
|
29 September 2018 at the Mental Calculation
World Cup in Wolfsburg (Germany)
|
| Marc Jornet Sanz (Spain) |
3:04.0 minutes
|
29 September 2018 at the Mental Calculation
World Cup in Wolfsburg (Germany) |
| Marc Jornet Sanz (Spain) |
3:03.9 minutes
|
29 September 2018 at the Mental Calculation
World Cup in Wolfsburg (Germany) |
Jeonghee Lee (South Korea)
|
3:02.9 minutes
|
29 September 2018 at the Mental Calculation
World Cup in Wolfsburg (Germany) |
| Marc Jornet Sanz (Spain) |
2:49.8 minutes
|
30 September 2018 at Hotel Primas in
Wolfsburg (Germany)
|
| Marc Jornet Sanz (Spain) |
2:44.2 minutes
|
22 January 2019 at school CEIP Padre
Moreno in Moixent (Spain)
|
| Marc Jornet Sanz (Spain) |
2:42.3 minutes
|
23 January 2019 at school CEIP Padre
Moreno in Moixent (Spain) |
There is also a detailed statistics page with the world rankings and
national records.
|
Books about Mental Calculation:
The Mental
Calculator's Handbook, written by the world champions
Robert Fountain and Jan van Koningsveld
ORDER
from amazon.com
from the UK:
ORDER
from amazon.co.uk
Practical Mental Arithmetic
ORDER
from amazon.com
from the UK:
ORDER
from amazon.co.uk
Dead Reckoning
- Calculating Without Instruments
ORDER
from amazon.com
from the UK:
ORDER
from amazon.co.uk
How to
calculate Quickly
ORDER
from amazon.com
from the UK:
ORDER
from amazon.co.uk
MORE BOOKS...
|
Mental Calculation: Extracting Roots
Calculating the Square Root of a Six-Digit Number
13th root of a 100 digit number
23rd root of a 200 digit number
see extra page with details about these
records
Mental Calculation: Calendar From Memory
20 Dates From One Century
All Dates From One Year
Most Dates From 1600-2100 Within One Minute
see extra page with details about
these records
Mental Calculation: Solving Linear Equation
Systems
Selçuk Soner Akgül (Turkey) solved ten linear equation systems (each
with three equations and three variables, and each having exactly
one integer solution) in 10:21.77 minutes on 20 October 2010 at the
9th Mathematics Symposium at Karadeniz Technical University, Turkey.
Mental Calculation: Factorizing Numbers
All prime factors have to be found for 20 random five-digit numbers
(which are not prime numbers)
Willem's tutorial for finding the factors of large numbers can be
found here.
Mental Calculation: Division
Ten problems for dividing a 10-digit number by a 5-digit number (no
remainders left) have to be solved.
| Willem Bouman
(Netherlands) |
6:07 min
|
18 October 2011 in Eindhoven |
Amit Garg (India)
|
5:45 min
|
15 March 2012 at Baybridge
Decision Technologies in Annapolis (USA)
|
| Hakan Gürbaşlar (Turkey) |
2:55.5 min
|
21 March 2015 at the Brain Awareness Week at
Neva Palas Hotel in Ankara, Turkey, 2015 |
Hakan Gürbaşlar (Turkey)
|
2:49.0 min
|
21 March 2015 at the Brain Awareness Week at
Neva Palas Hotel in Ankara, Turkey, 2015 |
| Hakan Gürbaşlar (Turkey) |
2:18.6 min
|
29 November 2015, Memoriad World Record
Attempts Week, Beylikduzu, Istanbul
|
| Jeonghee Lee (South Korea) |
1:26.6 min
|
10 November 2016, Memoriad in Las Vegas
|
| Jeonghee Lee (South Korea) |
0:53.2 min
|
30 September 2018 at Hotel Primas in
Wolfsburg (Germany) |
Aaryan Shukla (India)
|
0:41.6 min
|
16 July 2022 at the Mental Calculation
World Cup in Paderborn (Germany) |
Kaloyan Geshev (Bulgaria)
|
0:37.7 min
|
15 September 2024 at the Mental Calculation
World Cup in Paderborn (Germany) |
| Kaloyan Geshev (Bulgaria) |
0:32.3 min
|
15 September 2024 at the Mental Calculation
World Cup in Paderborn (Germany) |
Back to the World Record Homepage
