Converting an integer to Roman number

What is Roman number?

Roman numerals are a way of writing numbers that was used in ancient Rome. They are still used in some places today, like on clocks, book chapters, and movie titles.

Steps to convert an integer to Roman number

1. Enter an integer number

   

2. Tap MORE button to show Roman number

   

Basic Roman Numerals

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

How to Combine Them

1. Add Numbers: When a smaller number follows a larger number, add them together.

• Example: VI = 5 + 1 = 6

2. Subtract Numbers: When a smaller number comes before a larger number, subtract the smaller number from the larger one.

• Example: IV = 5 - 1 = 4

Examples

• II = 2 (1 + 1)
• IX = 9 (10 - 1)
• XII = 12 (10 + 1 + 1)
• XXVII = 27 (10 + 10 + 5 + 1 + 1)
• XL = 40 (50 - 10)
• XC = 90 (100 - 10)
• CXXIII = 123 (100 + 10 + 10 + 1 + 1 + 1)
• CD = 400 (500 - 100)
• CM = 900 (1000 - 100)
• MCMXCIV = 1994 (1000 + 900 + 90 + 4)

Where We Use Roman Numerals Today

• Clocks: Some clocks use Roman numerals to show the time.
• Books and Movies: They are used for chapters, volumes, or sequels.
• Dates: Sometimes we use Roman numerals for years, like MMXXIV for 2024.
• Buildings and Monuments: Many old buildings have dates written in Roman numerals.