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Roman Numerals Roman Numerals. The Mathematics of Love Please go to to view a video clip from “Square One TV”.

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Presentation on theme: "Roman Numerals Roman Numerals. The Mathematics of Love Please go to to view a video clip from “Square One TV”."— Presentation transcript:

1 Roman Numerals Roman Numerals

2 The Mathematics of Love Please go to http://www.youtube.com/watch?v=6DzfPcSysAg to view a video clip from “Square One TV”.

3 Roman Numerals Roman numerals are written as combinations of the seven letters below. The letters can be written as capital (XVI) or lower-case letters (xvi). Roman Numerals I = 1 V = 5 X = 10 L = 50 C = 100 D = 500 M = 1000

4 How to Translate Roman Numerals If smaller numbers follow larger numbers, the numbers are added. If a smaller number precedes a larger number, the smaller number is subtracted from the larger. For example, if you want to say 1 100 in Roman Numerals, you would say M for 1000 and then put a C after it for 100; in other words 1 100 = MC in Roman Numerals. Some more examples: VIII = 5 + 3 = 8 IX = 10 - 1 = 9 XL = 50 - 10 = 40 XC = 100 - 10 = 90 MCMLXXXIV = 1000+(1000- 100)+(50+30)+(5-1) = 1984

5 Where are Roman Numerals Used in Modern Times? Roman Numbers are still used today in a variety of applications. If you are creating an outline for a story or report, you will be expected to use Roman Numerals. They are also commonly used on clocks and watches, to number book chapters, films and big events. Monarchs and Popes are usually numbered with this system as are guitar chords and the cranial nerves.

6

7 In what year was Melk Abbey in Austria rebuilt? Melk Abbey, rebuilt in MDCCXVIII.

8 In what year was Melk Abbey in Austria rebuilt? Melk Abbey, rebuilt in MDCCXVIII. 1718

9 The Schloss Hotel in Durnstein dates from MDCXXX. In modern notation, that is:

10 1630

11 If the missing monarch was “Louis the Fourteenth”, choose (from the five given) the missing name in the passage below: _______________ had the magnificent palace at Versailles built as a fitting monument to one who considered himself the most powerful monarch in Christendom.  Louis XII  Louis XVI  Louis XXXXI  Louis XVII  Louis XIV

12 Is this what you reckon too? Louis XIV had the magnificent palace at Versailles built as a fitting monument to one who considered himself the most powerful monarch in Christendom.  Louis XII  Louis XVI  Louis XXXXI  Louis XVII  Louis XIV

13 Which Roman Numeral below should be used to represent 1999? a)MCMXCIX b)MCMIC c)MIM d)IMM e)All of the above

14 Which Roman Numeral below should be used to represent 1999? a) MCMXCIX b)MCMIC c)MIM d)IMM e)All of the above

15 Why doesn't 1999 = MIM (or 99 = IC or 999 = IM or... )? Lee K. Seitz explains it this way: The rules for Roman numerals as I learned them include: You can only subtract a power of ten from any Roman numeral. You can only subtract from the next two higher "digits." That is, you can only subtract I from V and X. You can only subtract X from L and C. And you can only subtract C from D and M. Or, in other words, subtraction is only done for (4 x 10 n ) and (9 x 10 n ). (That is, 4, 40, 400, 9, 90, and 900.) Or, to put it a completely different way: When converting to Roman numerals, convert each digit separately. So for 999, convert 900, 90, and 9 to give CM, XC, and IX (CMXCIX). Note that the Romans themselves didn't necessarily follow these rules, but as with everything else in Western society, we created more rules for it as time passed.

16 The movie “Gone with the Wind” starring Clark Gable and Vivian Leigh, was made in MCMXXXIX. What’s that in modern notation?

17 1939

18 References http://www.yourdictionary.com/crossword/romanums.html http://ablemedia.com/ctcweb/showcase/leesconverter3.html#limit http://www.youtube.com/watch?v=6DzfPcSysAg


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