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IceyLava108

Roman Numeral Challenge

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Give me any Roman Numeral less than 5,000 and I will solve it without any help.

 

For those who have little to no experience with Roman Numerals:

 

I - 1

V - 5

X - 10

L - 50

C - 100

D - 500

M - 1000

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This is not a valid roman numeral number; there is an M after the C, which is not a valid use of the number: Although you can put larger numbers such as X after a small number such as I, it cannot be used with thousands.

 

If you switched the M and C and then the C and D around like so:

 

MMMDCLV

 

The number will become 3,655.

 

:)

 

And that's why I never should mess around with Roman Numerals.

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The whole IX=9 stuff was added in the 19th century -- prior to that you never put them in reverse order at all.

 

I thought that movie copyrights typically said "MCMLXXXIV" for 1984. Maybe I'm remembering incorrectly.

 

Anyway: MMMDCCCLXXVI

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The whole IX=9 stuff was added in the 19th century -- prior to that you never put them in reverse order at all.

 

I thought that movie copyrights typically said "MCMLXXXIV" for 1984. Maybe I'm remembering incorrectly.

 

Anyway: MMMDCCCLXXVI

 

3,876

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Ok, I'm confused...IceyLava seemed to imply that you COULD say IX, XL, etc...just not with the thousands. But then Dave said that the whole "small before large" thing was a 19th century thing...so which is it?

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I'm right, of course! :plankton:

 

Prior to about 1850, you always put them in the "bigger to smaller" order: MDCLXVI

 

Then, somebody decided that it would be okay to "shortcut" the system by allowing letters that stood for "1"s in any place to be put to the left of the next two highest numbers, to denote "4" or "9". So, C, X, and I can do this:

 

IV = 4

IX = 9

XL = 40

XC = 90

CD = 400

CM = 900

 

Now, granted, I've never seen anyone use CD, but I am SURE I've seen MCM to mean 1900 in a year.

 

Also, you'll notice that on many clocks they use IX but they don't use IV. They use IIII instead. This might just be aesthetic, or it might be that the "4" thing came later than the "9" thing. [i also noticed that clocks have 4 numbers with just Is, 4 numbers with Vs and 4 numbers with Xs.]

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MDCLXVI

 

(this is actually the lowest number you can have that includes all the letters :P )

 

1,666

 

MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMI

 

Kind of a pointless topic, huh? :P

 

Not a valid numeral: you cannot have more than three of the same numeral in a row.

Dave is right. Originally they were not put in reverse order at all.

 

MMMDCCCCLXXXVIII

 

This isn't valid either, as you have four C's in a row.

 

However, I will change it to MMMDCCCLXXXVIII...

 

3,888

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Not a valid numeral: you cannot have more than three of the same numeral in a row.

 

Then how do you express the number 4, if you can't have four in a row and you can't do the lower-before-higher trick?

 

::Scratches head::

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Then how do you express the number 4, if you can't have four in a row and you can't do the lower-before-higher trick?

 

::Scratches head::

 

4 = IV

 

The I before the V means you subtract one from 5, equaling four. :)

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...but you said earlier that you can't do that...

 

 

: /

 

No I didn't :O

 

On Josh's first post, I corrected myself after I mistook his numeral for an invalid one.

 

IV (4) - The I behind the V means that you subtract I from V (1 from 5) getting 4.

IX (9) - The I behind the X means you subtract I from X (1 from 10) and get 9.

VI (6) The I in front of the V means you add I onto V (1 + 5) and get 6.

XI (11) The I in front of the X means you add I onto X (1 + 10) and get 11.

 

Understand now? :O

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You got mine wrong :P

The last two are VI, not IV.

The number was 1666. Coincidentally, that was the year the great fire of London occurred :/

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