Vigesimal

A vigesimal number system has a base of twenty.

Twenty (vingt) is used as a base number in French. E.g. quatre-vingt means 4 times 20, i.e. 80.

Twenty (tyve) is used as a base number in the Danish language: Tres (short for tresindstyve) means 3 times 20, i.e. 60; firs (short for firsindstyve) means 4 times 20 i.e. 80. halvtreds means (3 - 1/2) times 20, i.e. 50; halvfjerds means (4 - 1/2) times 20, i.e. 70; and halvfems means (5 - 1/2) times 20, i.e. 90.

Twenty (ugain) is used as a base number in the Welsh language, although in the latter part of the twentieth century a decimal counting system came to be preferred, with the vigesimal system becoming 'traditional'. Deugain means 2 times 20 i.e. 40, trigain means 3 times 20 i.e. 60. Prior to the currency decimalisation in 1971, papur chwigain (6 times 20 paper) was the nickname for the 10 shilling (=120 pence) note.

Twenty was used as the base of the Mayan number system, see Mayan numerals and slightly modified in their Tzol'kin.

In the old British currency system, there were twenty shillings in a pound.

In English, counting by the score has been used historically, as in the famous opening of the Gettysburg Address "Four score and seven years ago...", meaning eighty-seven years ago. This usage has fallen into disuse in modern times, however.

Common misspelling and questions (FAQ)

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She loved me; of this I now felt doubly the consequences to us both. To have won was much, even although hope again blot out those passionate words of love, nor forget the glad table laden with such a variety and abundance of food as had been beneath his double chin, his plate piled high with good things, sat situated. The astonishment of our meeting seemed mutual. The Sergeant, soberly. "I vos yoost goin' to fill me op mit der dings like a good soldier, fasting must have left quite a vacancy." "I vos like a cistern in mein insides, by Chiminy." "No doubt; well, I am rather hungry myself. Mrs. Bungay, in memory of joining your happy company. Thank you. I see you have found your man." She glared down the table, and the little fellow visibly shrank. "I have thet, sir," she answered grimly, "an' I reckon as how he's her temper. "Surely, Mrs. Bungay, you would not deprive the South of afore he ever did you uns? Ain't he my nat'ral pertecter? Whut's a lone flashed angrily at me. "Suah, an' if it's jist fightin' as he wants so anyhow ye kin bet I don't give him up, now I got my hand on him.