How to Learn Roman Numerals

Last Updated: September 21, 2022 References

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

1
Understand the basic symbols. Here's what you need to know to get started:^{[1]
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- I = 1
- V = 5
- X = 10
- L = 50
- C = 100
- D = 500
- M = 1000
2
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: My Dear Cat Loves Xtra Vitamins Intensely.^{[2]
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3
Learn all of the digits in the ones place. Here they are:^{[3]
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- I = 1
- II = 2
- III = 3
- IV = 4
- V = 5
- VI = 6
- VII = 7
- VIII = 8
- IX = 9
4
Learn all of the digits in the tens place. Here they are:^{[4]
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- X = 10
- XX = 20
- XXX = 30
- XL = 40
- L = 50
- LX = 60
- LXX = 70
- LXXX = 80
- XC = 90
5
Learn all of the digits in the hundreds place. Here they are:^{[5]
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- C = 100
- CC = 200
- CCC = 300
- CD = 400
- D = 500
- DC = 600
- DCC = 700
- DCCC = 800
- CM = 900
6
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.^{[6]
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- II = 2
- XXX = 30
7
Add smaller symbol values that are placed after large 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:^{[7]
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- XI = 11
- MCL = 1150
8
Subtract smaller symbol values that are placed before larger symbol values. In this case, you need to subtract the smaller value from the larger value. Here's how you do it:^{[8]
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- IV = 4
- CM = 900
9
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:^{[9]
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- 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.
10
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.
11
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.^{[10]
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Community Q&A

Question

How do I write 1,000,000?

Donagan

Top Answerer

As 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.
Question

How can I learn these in a day?

Community Answer

1) 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)+(1000-100)+(50+10+10+10)+(5+1+1) = 2987
Question

How do I remember roman numerals?

Donagan

Top Answerer

Use 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.