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In a vigesimal place system, twenty individual numerals (or digit symbols) are used, ten more than in the decimal system. One modern method of finding the extra needed symbols is to write ten as the letter A, or A 20, where the 20 means base 20, to write nineteen as J 20, and the numbers between with the corresponding letters of the alphabet.
20 Presumably from the practice, in counting sheep or large herds of cattle, of counting orally from one to twenty, and making a score or notch on a stick, before proceeding to count the next twenty. [3] [4] A distance of twenty yards in ancient archery and gunnery. [5] Threescore: 60 Three score (3x20) Large: 1,000 Slang for one thousand ...
21, Bagram, or Twenty Plus One is a drinking game. The game progresses by counting up from 1 to 21, with the player who calls "21" suffering a drinking penalty before the next round starts. The game progresses by counting up from 1 to 21, with the player who calls "21" suffering a drinking penalty before the next round starts.
1.141 606 809 779 03 × 10 20: C 48 H 98: n-octatetracontane: 49 417 612 400 765 382 272: 3.564 926 050 353 17 × 10 20: C 49 H 100: n-nonatetracontane: 50 1 117 743 651 746 953 270: 1.114 378 947 449 30 × 10 21: C 50 H 102: n-pentacontane: 51 2 994 664 179 967 370 611: 3.486 951 955 119 47 × 10 21: C 51 H 104: n-henpentacontane: 52 8 031 081 ...
For years after 2009, twenty eleven, twenty fourteen, etc. are more common, even in years earlier than 2009 BC/BCE. Likewise, the years after 1009 (until 1099) are also read in the same manner (e.g. 1015 is either ten fifteen or, rarely, one thousand fifteen).
The game is first mentioned by name in a 1611 Spanish dictionary where, under the entry for "card" (carta), it mentions the game of veinte y uno ("twenty-one").[1] [2] Just two years later, the first brief description of the game is given in a novella by Spanish author Miguel de Cervantes, most famous for writing Don Quixote.
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In 493 AD, Victorius of Aquitaine wrote a 98-column multiplication table which gave (in Roman numerals) the product of every number from 2 to 50 times and the rows were "a list of numbers starting with one thousand, descending by hundreds to one hundred, then descending by tens to ten, then by ones to one, and then the fractions down to 1/144." [6]