How to Learn Roman Numerals
Roman numerals are the numerical system used in ancient Rome. They use combinations of letters from the Latin alphabet to represent different values. Learning Roman numerals can help you write outlines, understand ancient Roman culture, and become a more cultured human being. Find out how to quickly master those tricky symbols after the jump.
Steps

Understand the basic symbols.Here's what you need to know to get started:
 I = 1
 V = 5
 X = 10
 L = 50
 C = 100
 D = 500
 M = 1000

Use a mnemonic to memorize the value order of the symbols.If you have a hard time remembering what goes where, just try this simple one:MyDearCatLovesXtraVitaminsIntensely.

Learn all of the digits in the ones place.Here they are:
 I = 1
 II = 2
 III = 3
 IV = 4
 V = 5
 VI = 6
 VII = 7
 VIII = 8
 IX = 9

Learn all of the digits in the tens place.Here they are:
 X = 10
 XX = 20
 XXX = 30
 XL = 40
 L = 50
 LX = 60
 LXX = 70
 LXXX = 80
 XC = 90

Learn all of the digits in the hundreds place.Here they are:
 C = 100
 CC = 200
 CCC = 300
 CD = 400
 D = 500
 DC = 600
 DCC = 700
 DCCC = 800
 CM = 900

Know that you can't have more than three of the same symbol in a row.When you place the same symbols together, you can just add their values. Normally the maximum number of the consecutive same symbols is three.
 II = 2
 XXX = 30

Add smaller symbol values that are placedafterlarge symbol values.Similar to the above rule, just add their values together. Remember the numeral must have the larger symbol value first for this to work. Here's how you do it:
 XI = 11
 MCL = 1150

Subtract smaller symbol values that are placedbeforelarger symbol values.In this case, you need to subtract the smaller value from the larger value. Here's how you do it:
 IV = 4
 CM = 900

Know how compound numbers are written.There are numerous rules that govern the way Roman numerals are supposed to look. Here are some rules to know:
 IV should be used rather than IIII
 2987 is written as MMCMLXXXVII because:
 The first M gives you 1000
 The next M gives you 1000
 The next CM gives you 900
 The next LXXX gives you 80
 The next VII gives you 7
 Therefore if you add the amounts together, you will get 2987.

Learn to write larger numbers.Since M = 1,000, if you want to represent one million, a bar, or line, is added above the numeral M, equaling one million. The bar above the numeral represents that figure times one thousand. Thus, M x M= 1,000,000.
 Five million would be represented by MMMMM with a bar above each M. This procedure is necessary because in Roman numerals, there is no larger symbol than M (1,000). This method isn't commonly used, but it's good to know how it works.

Check your work.If you want to make sure you converted a number correctly, check out some online converters to see if you're on track.
Community Q&A
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QuestionHow do I write 1,000,000?Top AnswererAs shown above, use M with a bar (horizontal line) above it. That means 1,000 multiplied by 1,000. Another way is to write M x M.Thanks!

QuestionHow can I learn these in a day?wikiHow ContributorCommunity Answer1) Memorize the meaning of the letters (e.g. M = 1000, C =100). 2) Learn to group the combinations in different digits (E.g. Thousandth, hundereded, tenth, ones; MMCMLXXVII = MM CM LXXX VII). 3) learn when to add and when to subtract. MMCMLXXVII = (1000+1000)+(1000100)+(50+10+10+10)+(5+1+1) = 2987Thanks!

QuestionHow do I know what I must add or take away in Roman numerals?wikiHow ContributorCommunity AnswerAccording to the information above, when a smaller number is to the left of a larger number, you subtract the smaller from the larger. When the smaller number is to the right of the larger number, you add the two. This makes sense, if you think of it in terms the left=less than, and right=more than [like the larger number, plus moving forward (smaller number to right) is in addition to the larger number)]. It is like Arabic numeral system of "10's" (most widely used in the world today), where if you count backwards (similar to left) you are taking away or subtracting, and if you count forward (like to the right), you are increasing in value or adding.Thanks!

QuestionWhat is 5,000 in Roman numerals?Community Answer5000 in Roman numerals would be V with a horizontal line on top. The horizontal line means to multiply by a thousand, so that would be 5 times 1000.Thanks!

QuestionCan I write 499 as ID?Top AnswererNo, it's written as CDXCIX. When subtracting one value from another (as in the case of ID), the rule is that you can't subtract a number whose value is less than ten percent of the number to its right. Thus, because the value of I is less than ten percent of the value of D, I can't be subtracted from D.Thanks!

QuestionWhy do students have to learn Roman numerals now?wikiHow ContributorCommunity AnswerRoman numerals are often seen in real life (on clocks, in math problems, in dates, etc.), so it's important that people know how to read them.Thanks!

QuestionWhat is the most I can divide a second?Top AnswererA picosecond is onetrillionth of a second. A time unit of even shorter duration is called a "Planck time," which is so short it's very difficult even to define or measure.Thanks!

QuestionWhy did they pick these letters?Top AnswererThe letters were not "picked." There is a long and convoluted history behind them. See the Wikipedia article "Roman Numerals."Thanks!

QuestionHow do I write 39? If it's XXXIX, then isn't X repeated four times?Top AnswererThe repetition rule refers only to consecutive use. Four X's are all right if they aren't consecutive.Thanks!

QuestionHow do I remember roman numerals?Top AnswererUse flash cards, or read this article (or others like it) over and over again until it's committed to memory. There are no shortcuts. You just have to memorize.Thanks!
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 CM = 900
 VI = 6
 C = 100
 L = 50
 X = 10
 VIII = 8
 IX = 9
 MCMLXXXIV = 1984 (M=1000; CM=900; LXXX=80; IV=4)
 II = 2
 XL = 40
 XX = 20
 M = 1000
 IV = 4
 XC = 90
 MMM = 3000
 VII = 7
 MMXI = 2011
 I = 1
 D = 500
 Write and learn. This might be one of the most boring things for some, but trust me this works best as things get stored in your long term memory.
 V = 5
 III = 3
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Video: Roman Numerals: The Epic Guide
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Date: 01.12.2018, 04:28 / Views: 81181