![]() John Von Neumann (Decem– February 8, 1957) He became a professor of languages in Norwhich University, Vermont.Ĥ. When his father died, he returned to the US and studied languages. ![]() His father capitalized on his talent by taking Zerah around the US and later to England, Scotland, Ireland and France.Ĭolburn was also good in languages. Many individuals and institutions offered free education to Zerah, but his father refused all of them. He was able to determine using his head that 4,294,967,297 is not prime and its divisor was 641. He was able to solve the Fermat number 2^32 + 1. At the age of 7, it took him 6 seconds to calculate the number of hours in 38 years, 2 months, and seven days. Zera Colburn was a child prodigy in mental math calculation. All problems were calculated up to 8 significant digits. She calculated 10 square root problems all with 6 digits in 2 minutes and 43 seconds. On January 3, 2012, he became a world record holder in calculating square root mentally. ![]() She was the only participant got a perfect score in Addition, Multiplication, Square Root as of this writing in all five Mental Calculation World Cup. ![]() Somani was the winner of the Mental Calculation World Cup 2010, where she was the youngest participant. In 1980, she multiplied two 13-digit numbers in 28 seconds.Ģ. In the same year, when asked the 23d root of a 201-digit number, she answered correctly in 50 seconds. Shakuntala Devi was considered as a “Human Computer.” In 1977, she computed the cube root of 188138517 faster than a computer. Below are some of the known mental math calculators in the past 200 years.ġ. ![]()
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