subtractive principle

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Jackson (Wyoming, United States). Jackson Lake (also called Jackson Hole), southern end of the Teton Range (the Grand Tetons), Grand Teton National Park, Wyoming, USA

7 Wonders of America

Andrew Jackson delivering a speech while on his way to Washington, D.C., for his inauguration in 1829. From Harper's Weekly, 1881.

5 Remarkably Close U.S. Presidential Elections

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12 Novels Considered the “Greatest Book Ever Written”

Click on image for enlargements of panel sections. The Ghent Altarpiece (open view) by Jan and Hubert van Eyck, 1432, polyptych with 12 panels, oil on panel; in the Cathedral of Saint-Bavon, Ghent, Belg.

The Most Stolen Work of Art

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

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Nostradamus and His Prophecies

United States electoral college map showing number of electoral votes by state.

How Does the Electoral College Work?

subtractive principle

numeral systems

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Roman numerals

In numerals and numeral systems: Roman numerals
The subtractive principle is seen in Hebrew number names, as well as in the occasional use of IV for 4 and IX for 9 in Roman inscriptions. The Romans also used unus de viginti (“one from twenty”) for 19 and duo de viginti (“two from twenty”)…
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