quatre-vingts

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Young boys working in a thread spinning mill in Macon, Georgia, 1909. Boys are so small they have to climb onto the spinning frame to reach and fix broken threads and put back empty bobbins. Child labor. Industrial revolution

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African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.

Timeline of the American Civil Rights Movement

Shadow of a man holding large knife in his hand inside of some dark, spooky buiding

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Mona Lisa, oil on wood panel by Leonardo da Vinci, c. 1503-06; in the Louvre, Paris, France. 77 x 53 cm.

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Adolf Hitler (Nazi, nazism, German leader).

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Groups of depositors in front of the closed American Union Bank, New York City. April 26, 1932. Great Depression run on bank crowd

Causes of the Great Depression

quatre-vingts

numeral system

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number bases

In numerals and numeral systems: Number bases
…it survives in the word quatre-vingts (“four twenties”), for 80; other traces are found in ancient Celtic, Gaelic, Danish, and Welsh. The base 60 still occurs in measurement of time and angles.
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Roman numerals

In numerals and numeral systems: Roman numerals
…(5) shows the use of quatre-vingts for 80, commonly found in French manuscripts until the 17th century and occasionally later, the numbers often being written like iiij^xx, vij^xx, and so on; and (6) represents the coefficient method, “four C” meaning 400, a method often leading to forms like ijM or…
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