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Shakuntala Devi

Shakuntala Devi is a mathematics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Shakuntala Devi rather than just read about it. In short: Shakuntala Devi (4 November 1929 – 21 April 2013) was an Indian mental calculator, astrologer, and writer, popularly known as the "Human Computer". Her talent earned her a place in the 1982 edition of The Guinness Book of World Records.

Shakuntala Devi — main illustration
Shakuntala Devi — illustration

Key takeaways

  • Shakuntala Devi belongs to mathematics; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Shakuntala Devi to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Shakuntala Devi from memory before moving on to harder problems.

Reference excerpt

Shakuntala Devi (4 November 1929 – 21 April 2013) was an Indian mental calculator, astrologer, and writer, popularly known as the "Human Computer". Her talent earned her a place in the 1982 edition of The Guinness Book of World Records. However, the certificate for the record was given posthumously on 30 July 2020, despite Devi achieving her world record on 18 June 1980 at Imperial College, London. Devi was a precocious child, and she demonstrated her arithmetic abilities at the University of Mysore without any formal education. Devi strove to simplify numerical calculations for students. She wrote several books in her later years, including novels as well as texts about mathematics, puzzles, and astrology. She wrote the book The World of Homosexuals (1977), which is considered the first study of homosexuality in India. She saw homosexuality in a positive light and is considered a pioneer in the field.

Early life Shakuntala Devi was born on 4 November 1929 at Bangalore, Karnataka. to a Kannada Brahmin family. Her father, C V Sundararaja Rao, worked as a trapeze artist, lion tamer, tightrope walker and magician in a circus. He discovered his daughter's ability to memorise numbers while teaching her a card trick when she was about three years old. Her father left the circus and took her on road shows that displayed her ability at calculation. She did this without any formal education. At the age of six she demonstrated her arithmetic abilities at the University of Mysore. In 1944, at the age of 15, Devi moved to London, United Kingdom.

Mental calculator Devi travelled to several countries around the world, demonstrating her arithmetic talents. She was on a tour of Europe throughout 1950 and was in New York City in 1976. In 1988, she travelled to the US to have her abilities studied by Arthur Jensen, a professor of educational psychology at the University of California, Berkeley. Jensen tested her performance at several tasks, including calculating large numbers. Examples of the problems presented to Devi included calculating the cube root of 61,629,875 and the seventh root of 170,859,375. Jensen reported that Devi provided the solution to the above-mentioned problems (395 and 15, respectively) before Jensen could copy them down in his notebook. Jensen published his findings in the academic journal Intelligence in 1990. In 1977, at Southern Methodist University, she computed the 23rd root of a 201-digit number in 50 seconds. Her answer, 546,372,891, was confirmed by calculations done at the US Bureau of Standards using the UNIVAC 1101 computer, for which a special program had to be written to perform such a large calculation. It took the UNIVAC computer 62 seconds to produce the correct answer. On 18 June 1980, she demonstrated the multiplication of two 13-digit numbers – 7,686,369,774,870 × 2,465,099,745,779. The Department of Computing at Imperial College London randomly picked these numbers. She correctly answered 18,947,668,177,995,426,462,773,730 in 28 seconds. This event was recorded in the 1982 Guinness Book of World Records. Writer Steven Smith commented, "the result is so far superior to anything previously reported that it can only be described as unbelievable." Shakuntala Devi explained many of the methods she used to do mental calculations in her 1977 book Figuring: The Joy of Numbers.

Book on homosexuality In 1977, she wrote The World of Homosexuals, the first published academic study of homosexuality in India, for which she was criticised. In the documentary For Straights Only, she said that her interest in the topic was because of her marriage to a homosexual man and her desire to look at homosexuality more closely to understand it. The book, considered "pioneering", features interviews with two young Indian homosexual men, a male couple in Canada seeking legal marriage, a temple priest who explains his views on homosexuality, and a review of the existing literature on homosexuality. It ends with a call for decriminalisation of homosexuality, and "full and complete acceptance—not tolerance and sympathy". The book, however, went mostly unnoticed at that time.

Personal life Devi returned to India in the mid-1960s, and she married Paritosh Banerji, an officer of the Indian Administrative Service from Kolkata. They divorced in 1979, after her husband's homosexuality was allegedly revealed. Their daughter Anupama Banerji claimed that Devi lied about her husband being gay to promote her book on homosexuals because her credibility on the subject matter was questioned. In 1980, she contested the Lok Sabha elections as an independent candidate for Mumbai South and for Medak in Andhra Pradesh (now in Telangana). In Medak she stood against the former Prime Minister Indira Gandhi, saying she wanted to "defend the people of Medak from being fooled by Mrs. Gandhi"; she came ninth, with 6,514 votes (1.47% of the votes). Devi returned to Bangalore in the early 1980s. In addition to her work as a mental calculator, Devi was a notable astrologer and an author of several books, including cookbooks and novels. She started with writing short stories and murder mysteries, and had a keen interest in music.

Death and legacy In April 2013, Devi was admitted to a hospital in Bangalore with severe respiratory problems. Over the following two weeks, she had heart and kidney complications. She died in the hospital on 21 April 2013. She was 83 years old. Her daughter Anupama Banerji is married to Ajay Abhaya Kumar, with whom she has two daughters, and lives in London. On 4 November 2013, Devi was honoured with a Google Doodle on what would have been her 84th birthday.

In popular culture A film on her life titled Shakuntala Devi was announced in May 2019. The film stars Vidya Balan in the lead title role and features Sanya Malhotra, Amit Sadh, and Jisshu Sengupta in the supporting roles. Produced by Sony Pictures Networks Productions, the film streamed worldwide on Amazon Prime Video on 31 July 2020.

… excerpt ends here. Continue reading the full article.

Illustrations

Shakuntala Devi illustration

Worked examples

Example 1 — a first encounter with Shakuntala Devi

Start with the simplest possible case. Write down what Shakuntala Devi claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In mathematics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Shakuntala Devi before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Shakuntala Devi ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Shakuntala Devi

In research
Shakuntala Devi appears in mathematics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Shakuntala Devi in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Shakuntala Devi is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1929 births, 2013 deaths, 20th-century Indian educators, so understanding it makes those chapters shorter.
In everyday life
Look for Shakuntala Devi outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study Shakuntala Devi in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Shakuntala Devi means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Shakuntala Devi out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Shakuntala Devi in simple terms?

Shakuntala Devi (4 November 1929 – 21 April 2013) was an Indian mental calculator, astrologer, and writer, popularly known as the "Human Computer". Her talent earned her a place in the 1982 edition of The Guinness Book of World Records.

Why does Shakuntala Devi matter?

Because it connects several mathematics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Shakuntala Devi?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Shakuntala Devi.

Tags

  • 1929 births
  • 2013 deaths
  • 20th-century Indian educators
  • 20th-century Indian mathematicians
  • 20th-century Indian non-fiction writers
  • 20th-century Indian women educators
  • 20th-century Indian women mathematicians
  • 20th-century Indian women writers
  • 20th-century astrologers
  • 21st-century astrologers
  • Indian Hindus
  • Indian LGBTQ rights activists

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