Is the Roman numeral IVXDCDDLLLIM valid or not? Roman Numerals (Numbers) Validator. How to convert MMDXLIII? Write it as a Hindu-Arabic number. Turn the number written in letters (symbols) of the Roman numeral system into a number written with regular digits
Is the entered Roman number, IVXDCDDLLLIM, valid or not?
1. The Roman numerals used to make the conversion:
I = 1; V = 5; X = 10; L = 50; C = 100; D = 500; M = 1,000;
The numerals and the groups of numerals written in subtractive notation must be written from left to right, in descending order of their values, from high to low. Some symbols (letters) can be repeated up to 3 times in a row: I, X, C, M, (X), (C), (M).
A group of Roman numerals written in subtractive notation = a group of two numerals (two letters), one of a lower value preceding another larger one. The only allowed subtractive groups are these: IV, IX, XL, XC, CD, CM, M(V), M(X), (X)(L), (X)(C), (C)(D), (C)(M). To calculate the value of a group subtract the value of the first symbol from the value of the second.
The subtractive notation that is used when writing with Roman numerals
A group of Roman numerals written in additive notation = a group of two or more numerals (letters), either of equal value or sorted in descending order of their values from high to low. To calculate the value of the group, add up the values of the symbols that make up the group.
The additive notation that is used when writing with Roman numerals
2. The groups of numerals written in subtractive notation:
IVXDCDDLLLIM
IV = V - I = 5 - 1 = 4;
CD = D - C = 500 - 100 = 400;
IVXDCDDLLLIM is not a valid Roman numeral.
3. Why is the Roman numeral not valid?
IVXDCDDLLLIM: A group of numerals written in subtractive notation, of lower value, IV ( = 4), cannot precede a numeral of larger value, X ( = 10).
IVXDCDDLLLIM: The numeral (the letter) X ( = 10) cannot precede this numeral of larger value, D ( = 500). X may only precede the numerals L ( = 50) and C ( = 100).
IVXDCDDLLLIM: The numeral (the letter) D ( = 500) cannot precede a numeral of larger value, M ( = 1,000).
IVXDCDDLLLIM: A group of numerals written in subtractive notation, CD ( = 400), cannot be placed after a numeral (a letter), D ( = 500), of the same range value (100 - 900).
IVXDCDDLLLIM: A group of numerals written in subtractive notation, of lower value, CD ( = 400), cannot precede a numeral of larger value, D ( = 500).
IVXDCDDLLLIM: The letter D ( = 500) cannot repeat itself.
IVXDCDDLLLIM: The numeral (the letter) D ( = 500) cannot precede a numeral of larger value, M ( = 1,000).
IVXDCDDLLLIM: The letter L ( = 50) cannot repeat itself.
IVXDCDDLLLIM: The numeral (the letter) L ( = 50) cannot precede a numeral of larger value, M ( = 1,000).
IVXDCDDLLLIM: The numeral (the letter) I ( = 1) cannot precede this numeral of larger value, M ( = 1,000). I may only precede the numerals V ( = 5) and X ( = 10).
4. Please correct or remove (some of) the symbols numerals:
IVXDCDDLLLIM
How to convert the Roman number:
MMDXLIII
written as a Hindu-Arabic number
(the numbers we use every day)
1. The Roman numerals used to make the conversion:
I = 1; X = 10; L = 50; D = 500; M = 1,000;
The numerals and the groups of numerals written in subtractive notation must be written from left to right, in descending order of their values, from high to low. Some symbols (letters) can be repeated up to 3 times in a row: I, X, C, M, (X), (C), (M).
A group of Roman numerals written in subtractive notation = a group of two numerals (two letters), one of a lower value preceding another larger one. The only allowed subtractive groups are these: IV, IX, XL, XC, CD, CM, M(V), M(X), (X)(L), (X)(C), (C)(D), (C)(M). To calculate the value of a group subtract the value of the first symbol from the value of the second.
The subtractive notation that is used when writing with Roman numerals
A group of Roman numerals written in additive notation = a group of two or more numerals (letters), either of equal value or sorted in descending order of their values from high to low. To calculate the value of the group, add up the values of the symbols that make up the group.
The additive notation that is used when writing with Roman numerals
MMDXLIII is a valid Roman numeral.
MMDXLIII meets all the rules of writing Roman numerals.
2. Identify the groups of symbols written in subtractive notation.
Identify and calculate the value of each group of any two symbols (any two letters) written in subtractive notation:
MMDXLIII
XL = L - X = 50 - 10 = 40;
3. Calculate the value of the Roman number.
Add up all the values of the individual Roman numerals and of the groups of numerals written in subtractive notation:
MMDXLIII =
M + M + D + XL + I + I + I =
1,000 + 1,000 + 500 + 40 + 1 + 1 + 1 =
2,543
MMDXLIII is a group of numerals written in both additive and subtractive notation.
Check the result (reverse the process).
How to convert the number 2,543
1. Break the number into place value subgroups (decompose it):
2,543 =
2,000 + 500 + 40 + 3;
2. Convert each subgroup:
2,000 = 1,000 + 1,000 = M + M = MM;
500 = D;
40 = 50 - 10 = L - X = XL;
3 = 1 + 1 + 1 = I + I + I = III;
3. Wrap up the Roman numeral (construct it):
2,543 =
2,000 + 500 + 40 + 3 =
MM + D + XL + III =
MMDXLIII;
The final answer:
IVXDCDDLLLIM is not a valid Roman numeral.
MMDXLIII = 2,543
MMDXLIII
written as a Hindu-Arabic number
(the numbers we use every day)
More operations of this kind:
Validate and convert Roman numerals to Hindu-Arabic numbers
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The set of basic symbols of the Roman system of writing numerals
The major set of symbols on which the rest of the Roman numberals were built:
I = 1 (one); V = 5 (five);
X = 10 (ten); L = 50 (fifty);
C = 100 (one hundred);
D = 500 (five hundred);
M = 1,000 (one thousand);
For larger numbers:
(*) V = 5,000 or |V| = 5,000 (five thousand); see below why we prefer this notation: (V) = 5,000.
(*) X = 10,000 or |X| = 10,000 (ten thousand); see below why we prefer this notation: (X) = 10,000.
(*) L = 50,000 or |L| = 50,000 (fifty thousand); see below why we prefer this notation: (L) = 50,000.
(*) C = 100,000 or |C| = 100,000 (one hundred thousand); see below why we prefer this notation: (C) = 100,000.
(*) D = 500,000 or |D| = 500,000 (five hundred thousand); see below why we prefer this notation: (D) = 500,000.
(*) M = 1,000,000 or |M| = 1,000,000 (one million); see below why we prefer this notation: (M) = 1,000,000.
(*) These numbers were written with an overline (a bar above) or between two vertical lines. Instead, we prefer to write these larger numerals between brackets, ie: "(" and ")", because:
- 1) when compared to the overline - it is easier for the computer users to add brackets around a letter than to add the overline to it and
- 2) when compared to the vertical lines - it avoids any possible confusion between the vertical line "|" and the Roman numeral "I" (1).
(*) An overline (a bar over the symbol), two vertical lines or two brackets around the symbol indicate "1,000 times". See below...
Logic of the numerals written between brackets, ie: (L) = 50,000; the rule is that the initial numeral, in our case, L, was multiplied by 1,000: L = 50 => (L) = 50 × 1,000 = 50,000. Simple.
(*) At the beginning Romans did not use numbers larger than 3,999; as a result they had no symbols in their system for these larger numbers, they were added on later and for them various different notations were used, not necessarily the ones we've just seen above.
Thus, initially, the largest number that could be written using Roman numerals was:
The reading rules of the Roman numerals, summary:
Two lists of the first Roman numerals (in ascending order):
Mathematical operations with Roman numerals: