Latin Primer - roman numbers #2

Lesson 2
Another way of expressing numbers centuries ago was to use Roman numerals.
They are written in combinations of the seven letters show below.
The letters can be written in capitals (XVI) or lower-case (xvi) letters.

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


If smaller value numbers follow value larger value numbers, add the values together. If a smaller value number precedes a larger value number subtract the smaller from the larger. For example:

VII = (5+2) = 7
IX = (10-1) = 9
XL = (50-10) = 40
MDCCII = 100+500+200_2 = 1702
MCMLXIV = 1000+(1000-100)+50+10+(5-1) = 1964


Common Roman Numerals

				1 = I	14 = XIV	27 = XXVII	150 = CL
				2 = II	15 = XV	28 = XXVIII	200 = CC
				3 = III	16 = XVI	29 = XXIX	300 = CCC
				4 = IV	17 = XVII	30 = XXX	400 = CD
				5 = V	18 = XVIII	31 = XXXI	500 = D
				6 = VI	19 = XIX	40 = XL	600 = DC
				7 = VII	20 = XX	50 = L	700 = DCC
				8 = VIII	21 = XXI	60 = LX	800 = DCCC
				9 = IX	22 = XXII	70 = LXX	900 = CM
				10 = X	23 = XXIII	80 = LXXX	1000 = M
				11 = XI	24 = XXIV	90 XC	1600 = MDC
				12 = XII	25 = XXV	100 = C	1700 = MDCC
				13 = XIII	26 = XXVI	101 = CI	1800 = MDCCC

Lessons in this series:

• Latin Primer - Parsing #6
• Latin Primer - General rules of Construction #5
• Latin Primer - Genealogical Terms #4
• Latin Primer - dates and times #3
• Latin Primer - roman numbers #2
• Latin Primer - numbers #1