Explanation: Shakuntala Devi, born on November 4, 1929, in Bangalore, India, was a mathematician and writer who became famous for her exceptional mental calculation abilities. She was often referred to as the "human calculator" due to her remarkable speed and accuracy in performing complex mathematical calculations without the use of any mechanical aids.
Shakuntala Devi's journey as a mathematical prodigy began at a very young age. She demonstrated her extraordinary abilities in mental arithmetic while assisting her father, a traveling circus performer, with card tricks. Her talent for mental calculation was evident from her early years, and she quickly gained recognition for her skills.
One of the most notable achievements of Shakuntala Devi was her ability to calculate the 23rd root of a 201-digit number in just 50 seconds, a feat that earned her a place in the Guinness Book of World Records in 1980. She also set a world record in 1977 by multiplying two 13-digit numbers in just 28 seconds, a task that required her to mentally compute the product of 7,686,369,774,870 and 2,465,099,745,779.
Shakuntala Devi's contributions to mathematics and mental calculation were not limited to her performances. She authored several books on mathematics, puzzles, and astrology, including "Puzzles to Puzzle You," "Figuring: The Joy of Numbers," and "Mathability: Awaken the Math Genius in Your Child." These books aimed to make mathematics accessible and enjoyable for a wide audience, particularly children.
Her work as a mental calculator and her efforts to popularize mathematics have left a lasting impact on the field. She inspired many to appreciate the beauty and power of numbers and encouraged the development of mental calculation skills. Shakuntala Devi's legacy continues to influence mathematicians, educators, and students around the world, making her a significant figure in the history of mathematics and mental calculation.
In summary, Shakuntala Devi was the "human calculator" due to her unparalleled ability to perform complex mathematical calculations mentally with remarkable speed and accuracy. Her contributions to mathematics and her efforts to popularize the subject have made her a celebrated figure in Indian and global history.