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Practice Roman Numerals Conversion

Practise converting Roman numerals to Arabic numbers and Arabic numbers to Roman numerals online. Customizable problems and ranges.

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This worksheet provides comprehensive, interactive practice on Roman and Arabic numerals. It lets you practise converting Roman numerals to Arabic numbers and Arabic numbers to Roman numerals customizable ranges.

What This Worksheet Covers

This interactive worksheet includes two distinct types of conversion problems.

1. Roman to Arabic

Convert given Roman numerals into their corresponding Arabic number values.

2. Arabic to Roman

Convert Arabic numbers into Roman numeral form.

Configurable Worksheet Options

This worksheet is fully configurable to suit different learning needs.

  • Select number ranges such as up to 50, 51 to 1000, or any custom range in between
  • Practice special year-based ranges from 1800 to 2035
  • Choose the number of problems per question type: 16, 24, or 36

These options allow learners to tailor difficulty and volume for focused or extended practice.

Roman Numerals Cheat Sheet

The Roman numeral symbols and their values are:

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

Addition & Repetition

When a symbol appears after a larger symbol, it is added to the larger symbol's value.

XV = 10 + 5 = 15

LIII = 50 + 3 = 53

If a symbol is repeated, the values are added together.

XXX = 10 + 10 + 10 = 30

CC = 100 + 100 = 200

2

Repetition Rules

The symbols I, X, C, and M can be repeated, but not more than three times in a row.

I, II, III, X, XX, XXX, C, CC, CCC, M, MM, MMM

IIII, CCCCC, MMMMM

The symbols V, L, and D are never repeated.

VV, LLL, DD

3

Subtraction

When a symbol appears before a larger symbol, it is subtracted from the larger symbol's value.

IV = 5 - 1 = 4

IX = 10 - 1 = 9

XL = 50 - 10 = 40

Then, why is 99 written as XCIX instead of IC? See next card.

IL ≠ 50 - 1 = 49

IC ≠ 100 - 1 = 99

IM ≠ 1000 - 1 = 999

4

Subtractive Combinations

The symbols I, X, and C can be used subtractively only in specific combinations:

This is why:

I can precede V and X.

49 = XLIX, not IL.

X can precede L and C.

99 = XCIX, not IC.

C can precede D and M.

999 = CMXCIX, not IM.

Download this cheat sheet!!

Online, Interactive, and Self-Correcting

This is a browser-based, interactive worksheet.

Learners enter answers directly into input fields and receive instant feedback, enabling quick correction and reinforcement. No printing or downloading is required.