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# Roman Numerals

Roman numerals are seen in textbooks, football games, analog clocks, and other places.

In this number system, letters are used instead of numbers.

The letters represent a value. Although Roman numerals are not part of most math curriculums today, they are good to know.

Roman Numerals:
I = 1       V = 5       X = 10       L = 50       C = 100       D = 500       M = 1000

0 Does not exist in Roman numerals.

Rules of Writing Roman Numerals
When writing Roman numerals with more than one letter, follow these rules:

Rule 1:
If the larger value is written first followed by the smaller value, then add the values.

Let's look at how we would write the number 6. The Roman numeral for 6 is VI.

V = 5
I = 1
V is the greater value
I is the lesser value

V is the greater value; it equals five. It is written first. I follows the V because it has a smaller value than 5.

Add them together to get 6.
VI = 6

Rule 2:
Let's learn the second rule.

If the smaller value is written first followed by the larger value, then subtract the values.

Let's look at how we would write the number 4. The Roman numeral for 4 is IV.

I =1
V = 5
I is the lesser value
V is the greater value

These two letters are used to create the number 4.
I is the smaller value; it equals to one. It is written first. V follows the I because it has a greater value than 1.
Subtract them to get 4.
IV = 4

Rule 3:
Another rule to remember is that the capital letters. I, X, C, and M are the only letters that can repeat.
You cannot write the number 100 with two capital LL. L cannot be repeated because it is not one of the four letters we discussed.

Rule 4:
Finally, do not allow any of these four letters to repeat more than three times in a row. In these two examples, the capital I is repeated three times. This is how we create the numbers 8 (VIII) and 13 (XIII).
Remember, I is the smaller value, so it goes after the V and X.