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Mental calculators were in great demand in research centers such as CERN before the advent of modern electronic calculators and computers. See, for instance, the modern book The Great Mental Calculators , whose introduction was written by Eberstark (see below).

Michael O'Boyle, an American psychologist working in Australia, has recently utilized fMRI scanning of blood flow during mental operation in prodigies to display startling results. Mathematical prodigies achieve blood flow to parts of the brain responsible for mathematical operations six to seven times the typical flow.

1 Techniques on Mental Calculation

• Mental calculation

2 Some mental calculators

• Hans Eberstark
• Jakow Trachtenberg
• Shakuntala DeviShakuntala Devi (Born 1939 born in Bangalore, India) is an Indian mathematician often referred to as a "human calculator". She demonstrated the multiplication of two 13-digit numbers 7,686,369,774,870 x 2,465,099,745,779 picked at random by the Computer D
• Leonhard EulerLeonhard Euler ( April 15, 1707 September 18, 1783) (pronounced "oiler") was a Swiss mathematician and physicist. He is considered (together with Gauss) to be one of the two greatest mathematicians. Leonhard Euler was the first to use the term " function"
• John Von Neumann
• Carl Friedrich GaussJohann Carl Friedrich Gauss (Gauss ( April 30, 1777 February 23, 1855) was a legendary German mathematician, astronomer and physicist with a very wide range of contributions; he is considered to be one of the greatest mathematicians of all time. His name
• John LawJohn Law ( 1671 April 21 1729 March 21) was a Scottish economist who believed that money was only a means of exchange and did not constitute wealth in itself; national wealth depended on trade. He is said to be the father of finance. He is responsible for
• Zacharias Dase
• Alexander Aitken
• Pericles Diamandi
• Urania Diamandi
• Bernhard RiemannGeorg Friedrich Bernhard Riemann ( September 17, 1826 June 20, 1866) was a German mathematician who made important contributions to analysis and differential geometry, some of them paving the way for the later development of general relativity. His name i
• Tathagat Avatar TulsiTathagat Avatar Tulsi (born September 9, 1987) of New Delhi, India, successfully passed his M. in Physics from Patna University, at the age of 12 years, two months, and 19 days, on November 28, 1999. Tulsi's parents recognised his talents when he was six.
• Willem Klein
• A.C. Aitken