How to remember Roman Numerals

OK, here is the best Mnemonic: Sentence to remember Roman Numerals I fished out from the Google Ocean. I only made a few changes to fit in my blog format. The ascending order of Roman numerals: LCDM:

Lucky Cows Drink Milk

Lucy Can't Drink Milk The Roman numerals in order for I, V, X (1, 5, 10) I Vant XRays The Roman numerals in order for I V X L C D M (1 5 10 50 100 500 1000) I Value Xylophones Like Cows Dig Milk A Poem to remember all the Roman numerals: M's "mille" (or 1000 said) D's half (500 - quickly read!) C's just a 100 (century!) and L is half again - 50! So all that's left is X and V (or 10 and 5) - and I - easy!

Explanation Roman Numerals

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

Roman numerals are expressed by letters of the alphabet and are rarely used today except for formality or variety. There are four basic principles for reading Roman numerals:

1. A letter repeated once or twice repeats its value that many times (XXX = 30, CC = 200, etc.).
2. One or more letters placed after another letter of greater value increases the greater value by the amount of the smaller (VI = 6, LXX = 70, MCC = 1200, etc.).
3. A letter placed before another letter of greater value decreases the greater value by the amount of the smaller (IV = 4, XC = 90, CM = 900, etc.). Several rules apply for subtraction: (a) only subtract powers of ten (I, X, or C, but not V or L); (b) only subtract one number from another; (c) do not subtract a number from one that is more than 10 times greater (that is, you can subtract 1 from 10 [IX] but not from 20—there is no such number as IXX).
4. A bar placed on top of a letter or string of letters increases the numeral's value by 1,000 times (XV = 15, = 15,000).

Hope it helps. C.C.