Check that the Roman numerals are valid. Convert and write them as Hindu-Arabic numbers. Turn numbers written using the Roman numeral system letters into numbers written in ordinary digits. Explanations

Validate and convert Roman numerals to Hindu-Arabic numbers

Learn how to convert Roman numerals to Hindu-Arabic numbers:

Identify and calculate the value of each group of numerals written in subtractive notation.

Calculate the Hindu-Arabic number: add up all the values of the individual Roman numerals (written in additive notation) and of the groups of numerals written in subtractive notation.

The latest Roman numerals validated and converted to Hindu-Arabic numbers

Is the Roman numeral MCDXLCCVDCCCI valid or not? Is it equal to 2,436 when written as a Hindu-Arabic number? Feb 01 03:51 UTC (GMT)
Is the Roman numeral (C)(D)MMLXVIII valid or not? Is it equal to 402,068 when written as a Hindu-Arabic number? Feb 01 03:51 UTC (GMT)
Is the Roman numeral XIXXVII valid or not? Is it equal to 36 when written as a Hindu-Arabic number? Feb 01 03:51 UTC (GMT)
Is the Roman numeral MDCCCXXXXI valid or not? Is it equal to 1,841 when written as a Hindu-Arabic number? Feb 01 03:51 UTC (GMT)
Is the Roman numeral IM valid or not? Is it equal to 999 when written as a Hindu-Arabic number? Feb 01 03:51 UTC (GMT)
Is the Roman numeral VMCCXI valid or not? Is it equal to 1,206 when written as a Hindu-Arabic number? Feb 01 03:51 UTC (GMT)
Is the Roman numeral (X)M(X)DCCCLXXVI valid or not? Is it equal to 19,876 when written as a Hindu-Arabic number? Feb 01 03:51 UTC (GMT)
Is the Roman numeral (C)(M)(V)MCCCLI valid or not? Is it equal to 906,351 when written as a Hindu-Arabic number? Feb 01 03:51 UTC (GMT)
Is the Roman numeral CXLIILXXXI valid or not? Is it equal to 221 when written as a Hindu-Arabic number? Feb 01 03:50 UTC (GMT)
Is the Roman numeral MDLXXVIMCDXXXVII valid or not? Is it equal to 3,011 when written as a Hindu-Arabic number? Feb 01 03:50 UTC (GMT)
Is the Roman numeral (C)(C)(C)(X)(C)XXIX valid or not? Is it equal to 390,029 when written as a Hindu-Arabic number? Feb 01 03:50 UTC (GMT)
Is the Roman numeral MCDLXVIMDCXCIV valid or not? Is it equal to 3,158 when written as a Hindu-Arabic number? Feb 01 03:50 UTC (GMT)
Is the Roman numeral CCXXL valid or not? Is it equal to 250 when written as a Hindu-Arabic number? Feb 01 03:50 UTC (GMT)
All the Roman numerals validated and converted to Hindu-Arabic numbers

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:

(*) 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:

(*) 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:

I. The set of the basic symbols of the Roman numerals

II. The rule of the repetition of the Roman numerals

III. The groups of the Roman numerals written in subtractive notation

IV. The additive notation of the Roman numerals


How to convert the Hindu-Arabic numbers to Roman numerals: breaking down the numbers into place value subgroups

Examples of converting Hindu-Arabic numbers to Roman numerals

Two lists of the first Roman numerals (in ascending order):

The list of the first 100 Roman numerals: the Roman numerals from 1 to 100

The list of the first 1,000 Roman numerals: the Roman numerals from 1 to 1,000

Mathematical operations with Roman numerals:

I. Addition. Learn by an example how to add the Roman numerals the right way, like the Romans were calculating, without the use of the Hindu-Arabic numbers. Steps, explanations

II. Subtraction. Learn by an example how to subtract the Roman numerals the right way, like the Romans were calculating, without the use of the Hindu-Arabic numbers. Steps, explanations

III. Addition and subtraction. Learn by an example how to add and subtract the Roman numerals the right way, like the Romans were calculating, without the use of the Hindu-Arabic numbers. Steps, explanations