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Method of mental calculation
abacus system of mental calculation is a system where users mentally visualize an abacus to carry out arithmetical calculations. No physical abacus is
Mental_abacus
Topics referred to by the same term
mechanical digital computer Mental abacus, a system involving visualization of an abacus to carry out arithmetical calculations Abacus Harmonicus, an ancient
Abacus_(disambiguation)
Calculating tool
An abacus (pl. abaci or abacuses), also called a counting frame, is a hand-operated calculating tool which was used from ancient times, in the ancient
Abacus
Arithmetical calculations using only the human brain
calculating the day of the week Hypercalculia Mental abacus Mnemonist Soroban Subitizing Alistair McIntosh (2004). Mental Computation: A strategies approach (PDF)
Mental_calculation
Exceptionally precocious child
strategies were found among prodigies mastering mental abacus calculation. The positions of beads on the physical abacus act as visual proxies of each digit for
Child_prodigy
System of rapid mental calculation
visualizing abacus in their head. Almost all proficient abacus users are adept at doing arithmetic mentally.[citation needed] Chisanbop – a 1940s Korean devised
Trachtenberg_system
Topics referred to by the same term
an area in west part of Golestan province in North of Iran Mental abacus; 暗算, Japanese mental calculation way by imagination of soroban (算盤) A type of Japanese
Anzan
Interdisciplinary theory
Goldin-Meadow S (2018). "The Role of Gesture in Supporting Mental Representations: The Case of Mental Abacus Arithmetic". Cognitive Science. 42 (2): 554–575. doi:10
Embodied_cognition
Private Catholic school in Mumbai, India
Young World Quiz. Also, a student from Campion won the gold medal in a mental abacus contest sponsored by UMCAS. The present school emblem, launched on 29
Campion_School,_Mumbai
South Korean abacus master (born 1963)
a South Korean abacus master. She is the only known soroban abacus master to have reached the eleventh dan. She is also known as Abacus Master (주산왕) in
Lee_Jeonghee
Chinese abacus
spelled suan pan or souanpan) is an abacus of Chinese origin. The earliest known written documentation of the Chinese abacus dates to the 2nd century BCE during
Suanpan
Annual memory competition
Organisation International Association of Memory Mental Calculation World Cup Mental calculation Mental abacus "The World Memory Championships - Memory Training
World_Memory_Championships
Deliberate process that transforms inputs to outputs with variable change
the small stones used as a counters on an abacus (Latin: abacus, Greek: ἄβαξ, romanized: abax). The abacus was an instrument used by Greeks and Romans
Calculation
Competition for mental calculators
Retrieved 3 May 2023. Bellos, Alex (10 October 2012). "Japanese abacus teacher wins Mental Calculation World Cup". The Guardian. Retrieved 3 May 2023. Robertson
Mental_Calculation_World_Cup
Japanese abacus
The soroban (算盤, そろばん; counting tray) is an abacus developed in Japan. It is derived from the ancient Chinese suanpan, imported to Japan in the 14th century
Soroban
home". Abacus Data. December 13, 2023. Retrieved December 13, 2023. "Conservatives open up their largest lead yet in an Abacus Data poll". Abacus Data.
Opinion polling for the 2025 Canadian federal election
Opinion_polling_for_the_2025_Canadian_federal_election
Series of monolithic columns on the Indian subcontinent
square abacus. Next would follow the Sankissa elephant and the Rampurva bull, also not yet benefiting from Mauryan polish, and using a Hellenistic abacus of
Pillars_of_Ashoka
Canadian provincial election
Retrieved January 13, 2025. "Abacus Data Ontario Poll: Ontario PCs lead by 18 as Ford government approval rating rebounds". Abacus Data. December 9, 2024.
2025_Ontario_general_election
Anonymous 17th-century spellbook
Mesopotamian mythology. Shah, Idries, The Secret Lore of Magic (London: Abacus, 1972). Contains portions of Ars Almandel and split sections the Goetia
The_Lesser_Key_of_Solomon
Spanish mental calculator
Alberto Coto García (born May 20, 1970) is a Spanish mental calculator. He was the world champion in mental calculation from 2008 to 2010. Professionally he
Alberto_Coto_García
Perception of object number without counting
counters in connected trays for calculations. In each place value, the Chinese abacus uses four or five beads to represent units, which are subitized, and one
Subitizing
Daughter of Winston Churchill (1909–1963)
of history – from the Duke of Marlborough to Winston Churchill. London: Abacus. ISBN 9780349119786. "Diana Churchill". rada.ac.uk. Royal Academy of Dramatic
Diana_Churchill
American psychologist, psychotherapist and writer
He gained notability as the creator of primal therapy, a treatment for mental illness that involves repeatedly descending into, feeling, and experiencing
Arthur_Janov
Progressive neurodegenerative disease
PMID 34101795. Bayley J (2000). Iris: A Memoir of Iris Murdoch. London: Abacus. ISBN 978-0-349-11215-2. OCLC 41960006.[page needed] Sparks N (1996). The
Alzheimer's_disease
Utopian community
educational non-profit organization). The most successful of the businesses was Abacus, Inc., an early Macintosh computer vendor in San Francisco, which eventually
Kerista
Mathematical technique for arithmetic
such as Roman numerals, and in some cases required a device such as an abacus. The word algorism comes from the name Al-Khwārizmī (c. 780–850), a Persian
Algorism
1893 painting by Edvard Munch
Exhibition". PKD Otaku #7. Janov, Arthur (1977). The Primal Scream. New York: Abacus. ISBN 0-349-11834-5. "Scream on the Surface". Munch-Museet. Archived from
The_Scream
American actor (1918–1951)
p. M4. Thomson, David (1993). Showman: The Life of David O. Selznick. Abacus, p. 418. The Eddie Mannix Ledger, Los Angeles: Margaret Herrick Library
Robert Walker (actor, born 1918)
Robert_Walker_(actor,_born_1918)
Author and psychologist
ISBN 978-1847093646 2019: The Incurable Romantic and Other Unsettling Revelations, Abacus, ISBN 978-0349142951 2020: The Act of Living: What the Great Psychologists
Frank_Tallis
Arithmetic operation
October 23, 2018 Planetmath division Division on a Japanese abacus selected from Abacus: Mystery of the Bead Chinese Short Division Techniques on a Suan
Division_(mathematics)
2021 film by Wes Anderson
underworld accountant Albert, nicknamed "the Abacus", who possesses their shared financial records. The Abacus is being held in a solitary confinement cell
The_French_Dispatch
Condition involving social and behavioral differences
with mental health or learning disability services, or a history of neurodevelopmental conditions (including learning disabilities and ADHD) or mental health
Autism
High school diploma test
Vision-enhancing technologies Use of video equipment Use of a talking calculator or abacus Use of a sign language interpreter Use of a scribe (a person who writes
General Educational Development
General_Educational_Development
Implement or device used to inflict damage, harm, or kill
construed to include anything used to gain a tactical, strategic, material, or mental advantage over an adversary or enemy target. While ordinary objects such
Weapon
American actor (1925–1985)
(link) David Thomson (1993). Showman: The Life of David O. Selznick, London: Abacus, p. 656. ISBN 978-0349105239, OCLC 1000546022 "Daily Record from Banning
Rock_Hudson
1415 English victory in the Hundred Years' War
V and the Battle that Made England] (revised and updated ed.). London: Abacus. ISBN 978-0-349-11918-2. Bennett, M. (1994). "The Development of Battle
Battle_of_Agincourt
Canadian provincial election
David (June 1, 2022). "Final Abacus Data Poll: Ontario PCs lead by 13 as they head towards another majority government". Abacus Data. Retrieved June 1, 2022
2022_Ontario_general_election
One of the four basic arithmetic operations
Subtraction, and More Subtraction Worksheets Subtraction Game at cut-the-knot Subtraction on a Japanese abacus selected from Abacus: Mystery of the Bead
Subtraction
English musician (born 1945)
Turner, Steve (1976). Conversations with Eric Clapton. New York City: Abacus. p. 94. ISBN 978-0349134024. "Dylan Jones: 'In the film of 'London Hyde
Eric_Clapton
1954 book by Aldous Huxley
274 Bedford (1974) p. 142 Murray, Nicholas (2003) Aldous Huxley, p. 399, Abacus ISBN 0-349-11348-3 Bedford(1974) p. 145 Murray (2003) p. 399 Bedford (1974)
The_Doors_of_Perception
1960 play by Noël Coward
"Waiting In The Wings", curtainup.com, 21 December 1999 Castle, Charles. Noël, Abacus, 1974, ISBN 0-349-10482-4, p. 235 Internet Broadway Database listing Review
Waiting_in_the_Wings_(play)
Norwegian rock band
substituted for Hank on the US tour as the singer was hospitalized in a mental facility. By fall, the band returned for another 16 European dates on the
Turbonegro
The White Man's Conquest of the Dark Continent from 1876 to 1912. London: Abacus. pp. 439–449. ISBN 978-0-349-10449-2. Slade, Ruth (1962). King Leopold's
List of incidents of cannibalism
List_of_incidents_of_cannibalism
Cohort born from 1946 to 1964
Revolution". The Age of Extremes: The Short Twentieth Century 1914-1991. Abacus. ISBN 978-0-349-10671-7. Suri, Jeremi (February 2009). "The Rise and Fall
Baby_boomers
Overtime work schedule from China
'996' work hours and you'll end up in an ICU, says Chinese developer". Abacus. Archived from the original on 31 March 2019. Retrieved 31 March 2019. "GitHub
996_working_hour_system
King of Macedon from 336 to 323 BC
Holland, Tom (2003). Rubicon: Triumph and Tragedy in the Roman Republic. Abacus. ISBN 978-0-349-11563-4. Holt, Frank Lee (2003). Alexander the Great and
Alexander_the_Great
1617 device for calculating products and quotients
(96431) are placed on the board, as shown in the graphic below. Using the abacus, all the products of the divisor from 1 to 9 are found by reading the displayed
Napier's_bones
Arithmetic operation
tackling more difficult problems. Mechanical aids range from the ancient abacus to the modern computer, where research on the most efficient implementations
Addition
Ancient kingdom in western Tibet
Charles. (1999). The Search for Shangri-La: A Journey into Tibetan History. Abacus Edition, London. (2000), pp. 266–267; 273–274. ISBN 0-349-11142-1. Tibetan
Zhangzhung
1977 video game
characteristics being made clear later, players have their own "utterly personal mental image of what a grue looks like". They noted that while it started as a
Zork
Indian nationalist leader (1897–1945)
James, L (1997), Raj, the Making and Unmaking of British India, London: Abacus Jesudasen, Yasmine (2006), Voices of Freedom Movement, Sura Books, ISBN 978-81-7478-555-8
Subhas_Chandra_Bose
Freshwater lake in the Tibet Region
The Search for Mount Kailas and the Sources of the Great Rivers of Asia. Abacus. pp. 3–8. ISBN 978-1-40552-497-1. Archived from the original on 20 August
Lake_Manasarovar
Balance and Composure Barely Civil Ben Quad Boys Life Braid The Brave Little Abacus Camping in Alaska Canadian Softball Cap'n Jazz The Cardboard Swords Carly
List_of_Midwest_emo_bands
Branch of elementary mathematics
make them easier to read. The abacus is a more advanced tool to represent numbers and perform calculations. An abacus usually consists of a series of
Arithmetic
Private healthcare provider in Australia
private inpatient mental health facilities in Australia with 12 hospitals providing care. Healthscope Hospitals provide treatment for mental health issues
Healthscope
American drama film by William A. Wellman
26, 2020. Thomson, David (1993). Showman: The Life of David O. Selznick. Abacus. p. 245. ISBN 978-0-349-10523-9. Schatz, Thomas (2015). The Genius of the
A_Star_Is_Born_(1937_film)
Film by Alfred Hitchcock
Thomson, David (1993). Showman: The Life of David O. Selznick. New York: Abacus. ISBN 978-0-394-56833-1. Truffaut, François (1983) [1967]. Hitchcock/Truffaut
Spellbound_(1945_film)
French writer and nobleman (1740–1814)
Love, Brenda (2002). The Encyclopedia of Unusual Sex Practices. London: Abacus. ISBN 978-0-349-11535-1. Marshall, Peter (2008). Demanding the impossible:
Marquis_de_Sade
Religious mountain in Tibet Autonomous Region
The Search for Mount Kailas and the Sources of the Great Rivers of Asia. Abacus. ISBN 978-1-40552-497-1. Archived from the original on 20 August 2024. Retrieved
Mount_Kailash
1944 film by John Cromwell
17, 2014. Thomson, David (1993). Showman: The Life of David O. Selznick. Abacus, p. 418. OCLC 1397161 Since You Went Away, a Film of Wartime Domestic Life
Since_You_Went_Away
American Chinese dumpling appetizers
Auxiliary". Pittsburgh Post-Gazette. p. 5 – via Google Books. Debczak, Michele (March 17, 2023). "The Puzzling Origins of Crab Rangoon". Mental Floss.
Crab_Rangoon
Federal by-election in Ontario, Canada
the 44th Canadian Parliament and garnered national attention; a poll from Abacus Data in mid-July suggested that 63% of Canadians nationwide were aware of
2024 Toronto—St. Paul's federal by-election
2024_Toronto—St._Paul's_federal_by-election
Music genre derivative of punk rock
later years of the fourth-wave, bands such as Crying and the Brave Little Abacus experimented with emo, developing the "post-emo" genre. Post-emo was the
Emo
Prime Minister of the United Kingdom (1964–1970, 1974–1976)
Retrieved 26 September 2011. Davies, A. J. (1996). To Build a New Jerusalem. Abacus. pp. 342–356. ISBN 0-349-10809-9. Ten Years of New Labour, edited by Matt
Harold_Wilson
1970s mass killing of Cambodians carried out by the Khmer Rouge
medical experts, Thirith was found to be unfit to stand trial due to a mental condition. Sary died of heart failure in 2013 while his trial was in progress
Cambodian_genocide
Queen Victoria's reign, 1837 to 1901
Golden Years". The Age of Extremes: The Short Twentieth Century 1914-1991. Abacus. ISBN 9780349106717. Thompson, F. M. L. (1988). Rise of Respectable Society:
Victorian_era
Japanese manga series by Kōhei Horikoshi
manga's removal from its services in China, the English-language news service Abacus reached out to bilibili and Tencent for its request. The former stated that
My_Hero_Academia
Powered mechanical device
requirements of work, automation greatly decreases the need for human sensory and mental requirements as well. Automation plays an increasingly important role in
Machine
British soldier and founder of The Scout Association (1857–1941)
Baden-Powell (in French). Perrin. Pakeham, Thomas (1979). The Boer War. London: Abacus. Palstra, Theo P.M. (April 1967). Baden-Powel, zijn leven en werk (in Dutch)
Robert Baden-Powell, 1st Baron Baden-Powell
Robert_Baden-Powell,_1st_Baron_Baden-Powell
English actress (1937–2020)
Dominic (2007). White Heat: A History of Britain in the Swinging Sixties. Abacus. ISBN 9780349117975. {{cite book}}: Check |isbn= value: checksum (help)
Barbara_Windsor
Talent manager (1909–1997)
Guralnick, Peter (1995). Last Train to Memphis: Rise of Elvis Presley. Abacus. ISBN 978-0-349-10651-9. Brown, Mick (August 10, 2023). "Elvis, Inc: Riley
Colonel_Tom_Parker
Effort to improve purported human genetic quality
(2002). Eugenics: The Future of Human Life in the 21st Century. London: Abacus. p. 48. ISBN 0349113777. Lively, Curtis M. (June 2010). "The Effect of Host
Eugenics
Supernatural being originating in folklore
2016-11-22. Rudgley, Richard The Encyclopedia of Psychoactive Substances, pub. Abacus 1998 ISBN 0 349 11127 8 pps. 20-21. Ian Cunnison (1958). "Giraffe hunting
Ghost
Impairment in recognition of visually presented objects
many mistakes when trying to identify objects. For example, he called an abacus "skewers on a kebab" and a badminton racquet a "fencer's mask". A dart was
Visual_agnosia
Use of knowledge for practical goals
extension of the human organism that replicated or amplified bodily and mental faculties. Marx framed it as a tool used by capitalists to oppress the proletariat
Technology
1760–1840 agrarian to industrial era shift
supported by schools that taught numeracy in financial calculations through abacus schools. Britain provided the legal and cultural foundations that enabled
Industrial_Revolution
Algorithms for calculating square roots
1093/comjnl/1.3.142. Guy, Martin (1985). "Fast integer square root by Mr. Woo's abacus algorithm". University of Kent at Canterbury (UKC). Archived from the original
Square_root_algorithms
2002 novel by Christopher Brookmyre
threatening to kill Parnell, a prisoner who helped Zal toughen up both mentally and physically while behind bars. "American" Harry Arthur Real name Javier
The_Sacred_Art_of_Stealing
Mauryan emperor from 269 to 232 BCE
Mahabodhi Temple, attributed to Ashoka Rampurva bull capital, detail of the abacus, with two "flame palmettes" framing a lotus surrounded by small rosette
Ashoka
1438–1533 empire in South America
of positionally varying mathematical values, perhaps functioning as an abacus. Calculation was facilitated by moving piles of tokens, seeds or pebbles
Inca_Empire
Electric light bulb with a resistively heated wire filament
and disrupt sleep and circadian rhythms, with potential implications for mental illness. Some research has been carried out to improve the efficacy of commercial
Incandescent_light_bulb
Cambodian communist leader (1925–1998)
hours of labour were employed at training camps to ramp up the physical and mental pressure and thus facilitate indoctrination. Short commented that "no other
Pol_Pot
Rashidun caliph from 634 to 644
the Sword: The Battle for Global Empire and the End of the Ancient World. Abacus. ISBN 978-0-349-12235-9. Zein, Ibrahim Mohamed; El-Wakil, Ahmed (2022).
Umar
British politician (1948–2022)
manslaughter and attempted murder, but the jury at his trial found him to be mentally unfit to stand trial. He was detained in Broadmoor for observation, and
Nigel Jones, Baron Jones of Cheltenham
Nigel_Jones,_Baron_Jones_of_Cheltenham
Mechanical analog computer
Hand-held device for reference or calculation Soroban – Japanese abacus Suanpan – Chinese abacus Timeline of computing Vernier scale – Auxiliary scale of a
Slide_rule
Mechanical machine for arithmetic operations for absolute calculators
and later still as beads mounted on wires fixed in a frame, as in the abacus. This instrument was probably invented by the Semitic races and later adopted
Mechanical_calculator
1999 novel by Jane Rogers
by Little, Brown and Company 2000, first paperback edition, published by Abacus 2007, republished 2008, reprinted: ISBN 978-0-349-11229-9 "Author interview
Island_(Rogers_novel)
British journalist, writer and politician (1911–1968)
the Heart of History – from the Duke of Marlborough to Winston Churchill. Abacus. ISBN 978-0-349-11978-6. Matthew, Colin, ed. (2004). Dictionary of National
Randolph_Churchill
Social behavior and norms of a society
cross culture. For example, people who are raised in a culture with an abacus are trained with distinctive reasoning style. Cultural lenses may also make
Culture
Living in a single-person household
Revolution". The Age of Extremes: The Short Twentieth Century 1914-1991. Abacus. ISBN 978-0-349-10671-7. "Falling wine sales reflect a lonelier and more
Singleton_(lifestyle)
Methods to calculate the day of the week
dates. It was later modified to convert any Gregorian date, even on an abacus. On Motorola 68000-based devices, there is similarly less need of either
Determination of the day of the week
Determination_of_the_day_of_the_week
British writer, lay theologian, and scholar (1898–1963)
ISBN 0-85967-853-9 White, Michael (2005), C. S. Lewis: The Boy Who Chronicled Narnia. Abacus. ISBN 0-349-11625-3 Wielenberg, Erik J. (2007), God and the Reach of Reason
C._S._Lewis
English writer and political activist (born 1963)
of West Papua. London: Abacus. ISBN 0-7181-3153-3 (1991). Amazon Watershed: The new environmental investigation. London: Abacus. ISBN 0-7181-3428-1 (1992)
George_Monbiot
Historical period in Britain from 1901 to 1910
of Woman: A History of the Suffragette Movement and the Ideas behind it (Abacus, 2004). Knight, Patricia (1977). "Women and Abortion in Victorian and Edwardian
Edwardian_era
mathematics, geology and astronomy. Among the earliest inventions were the abacus, the sundial, and the Kongming lantern. The Four Great Inventions – the
History of science and technology in China
History_of_science_and_technology_in_China
Device used for calculations
calculations were: bones (used to tally items), pebbles, counting boards, and the abacus, which have been used by Sumerians and Egyptians before 2000 BC. Except
Calculator
British Army officer, diplomat and writer (1888–1935)
(2005). The Golden Warrior: The life and legend of Lawrence of Arabia. Abacus. p. 263. Mack 1976, p. 420. Mack 1976, p. 33. Lawrence, T.E. (1997). Seven
T._E._Lawrence
British royal recognitions
David Steven Ellis. For services to Paratriathalon. Lisa Evans. Manager, Abacus Nursery and Childcare Ltd, Kent. For services to Early Years. Roger Kenneth
2025_New_Year_Honours
Finding the number of elements of a finite set
devices can also be used to facilitate counting, such as tally counters and abacuses. Inclusive/exclusive counting are two different methods of counting. For
Counting
Branch of psychology concerned with the scientific study of human learning
internalized to form mental constructs. "Zone of Proximal Development" (ZPD) is a term Vygotsky used to characterize an individual's mental development. He
Educational_psychology
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