Difference between revisions of "Roman Numerals"
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== Subtraction == | == Subtraction == | ||
Letters are put in order from greatest to least. A lesser letter occurring before a greater letter is subtraction. When subtracting, only subtracting powers of ten such as I, X, or C is allowed. You cannot subtract with V, for example. Too, you can only subtract one digit away. For example, IIX is not 8 but rather use VIII for 8. Finally, you cannot subtract one letter from another letter if it is ten times greater than it, so one would not be able to subtract X from M since M is one hundred times greater than X, yet you can subtract X from either L or C. | Letters are put in order from greatest to least. A lesser letter occurring before a greater letter is subtraction. When subtracting, only subtracting powers of ten such as I, X, or C is allowed. You cannot subtract with V, for example. Too, you can only subtract one digit away. For example, IIX is not 8 but rather use VIII for 8. Finally, you cannot subtract one letter from another letter if it is ten times greater than it, so one would not be able to subtract X from M since M is one hundred times greater than X, yet you can subtract X from either L or C. | ||
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* Example: MCMLXXXIII = 1983 | * Example: MCMLXXXIII = 1983 | ||
* Example: MCC = 1200 | * Example: MCC = 1200 | ||
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| + | == Modern Use == | ||
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| + | While the [[Arabic_numerals|Arabic system]] has become the standard contemporary numeral system, Roman numerals are still used today in limited settings. They express dates on building [[Cornerstone|cornerstones]] or denote an epoch in [[art]] or [[literature]]. They also count installments in a series, such as movie sequels, the [[Super Bowl]], the [[Ultimate Fighting Championship]], or the [[Olympics]]. | ||
[[category:mathematics]] | [[category:mathematics]] | ||
[[category:roman history]] | [[category:roman history]] | ||
Revision as of 23:27, February 18, 2008
Roman Numerals are the letters used by the Roman Empire to show numeric values.
- I = 1
- V = 5
- X = 10
- L = 50
- C = 100
- D = 500
- M = 1000
Large Numbers
To write large numbers, like for instance five thousand, Romans would not use MMMMM. Rather, they would write V and put a bar over it. A bar over a letter represents one thousand times that letter.
Subtraction
Letters are put in order from greatest to least. A lesser letter occurring before a greater letter is subtraction. When subtracting, only subtracting powers of ten such as I, X, or C is allowed. You cannot subtract with V, for example. Too, you can only subtract one digit away. For example, IIX is not 8 but rather use VIII for 8. Finally, you cannot subtract one letter from another letter if it is ten times greater than it, so one would not be able to subtract X from M since M is one hundred times greater than X, yet you can subtract X from either L or C.
- Example: MCMLXXXIII = 1983
- Example: MCC = 1200
Modern Use
While the Arabic system has become the standard contemporary numeral system, Roman numerals are still used today in limited settings. They express dates on building cornerstones or denote an epoch in art or literature. They also count installments in a series, such as movie sequels, the Super Bowl, the Ultimate Fighting Championship, or the Olympics.