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Adding ten 10-digit numbers, 10 tasks in 10 minutes Winner: Alberto Coto (Spain); 10 correct results; 5:50 minutes, world record; Multiplying two 8-digit numbers, 10 tasks in 15 minutes Winner: Alberto Coto (Spain), 8 correct results; Calendar Calculations, two series one minute each, dates from the years 1600–2100
Mental calculation has long been a component of mathematical education. Mental calculation consists of arithmetical calculations using only the human brain, with no help from any supplies (such as pencil and paper) or devices such as a calculator.
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The Curta was conceived by Curt Herzstark in the 1930s in Vienna, Austria.By 1938, he had filed a key patent, covering his complemented stepped drum. [3] [4] This single drum replaced the multiple drums, typically around 10 or so, of contemporary calculators, and it enabled not only addition, but subtraction through nines complement math, essentially subtracting by adding.
Many graphical calculators work much like computers and use versions of 7-bit, 8-bit or 9-bit ASCII-derived character sets or even UTF-8 and Unicode. Many of them have a tool similar to the character map on Windows. They also have BASIC like functions such as chr$, chr, char, asc, and so on, which sometimes may be more Pascal or C like.
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First. Upon being asked, how many seconds there are in a year and a half, he answered in about two minutes, 47,304,000. Second. On being asked how many seconds a man has lived, who is seventy years, seventeen days and twelve hours old, he answered, in a minute and a half, 2,210,500,800.
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