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Roman numerals were in use until the 14th century, when system was replaced by the more convenient Arabic numerals. However, Roman numerals are still used today in certain contexts.

With Roman numerals converter you can convert numbers between 1 and 3999.
For larger numbers Romans used identical letters with a line above the letter.

Enter a Roman numeral and convert it to a decimal.

Enter a Roman numeral and convert it to a decimal.

Enter a Roman numeral

{{ronumdn}} = {{ronumres}}

Enter a decimal number and convert it to a Roman numeral.

Enter a decimal number

{{arnumdn}} = {{arnumres}}

Select a Roman numeral and check out its decimal value.

{{shwro}} = {{shwar}}

Before start choose a number and a difficulty of the questions.

{{acttit}}

{{doque[0].id+1}}. question

{{doque[0].ans[0].f1}}
=

{{doque[1].id+1}}. question

{{doque[1].ans[0].f1}}
=

{{doque[2].id+1}}. question

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=

{{doque[3].id+1}}. question

{{doque[3].ans[0].f1}}
=

{{doque[4].id+1}}. question

{{doque[4].ans[0].f1}}
=

{{doque[5].id+1}}. question

{{doque[5].ans[0].f1}}
=

{{doque[6].id+1}}. question

{{doque[6].ans[0].f1}}
=

{{doque[7].id+1}}. question

{{doque[7].ans[0].f1}}
=

{{doque[8].id+1}}. question

{{doque[8].ans[0].f1}}
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{{doque[9].id+1}}. question

{{doque[9].ans[0].f1}}
=

{{doque[10].id+1}}. question

{{doque[10].ans[0].f1}}
=

{{doque[11].id+1}}. question

{{doque[11].ans[0].f1}}
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{{doque[12].id+1}}. question

{{doque[12].ans[0].f1}}
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{{doque[13].id+1}}. question

{{doque[13].ans[0].f1}}
=

{{doque[14].id+1}}. question

{{doque[14].ans[0].f1}}
=

Result - {{acttit}}

{{quitits[0]}}

{{quitits[1]}}

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POPULAR

KNOWLEDGE CARDS

Roman numerals | Arabic numerals |

I | 1 |

V | 5 |

X | 10 |

L | 50 |

C | 100 |

D | 500 |

M | 1000 |

Roman numerals have no symbol to represent 0.

If a numeral comes after a numeral that is larger or equal in value, then it must be added to the numeral before it.

VI = 5 + 1 = 6

XX = 10 + 10 = 20

A smaller numeral placed before a larger numeral indicates subtraction of that smaller numeral from the larger one.

You cannot subtract more than one value from a Roman numeral.

IV = 5 - 1 = 4

IX = 10 - 1 = 9

You cannot add more than three of the same Roman numeral together.

III = 3

Wrong: IIII, correct: IV = 4

Only powers of ten (I, X, C, M) can be subtracted.

Value 5

Wrong: VX (10 - 5)

Correct: V (5)

You can subtract only value that is 1/5th (one-fifth) or 1/10th (one-tenth) the larger one.

Wrong: IC = 100 - 1 = 99

Correct: XCIX = (100 - 10) + (10 - 1) = 99

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