Roman Numerals

Thousands of years ago, in ancient Rome, the Romans used a system of numbers that we call Roman numerals. These are the values of each symbol

Unlike our system of numbers, Roman numerals express numbers as sums and differences. For example, 6 is VI (five + one), but nine is IX (ten - one). In general, when a smaller Roman numeral follows a larger numeral, you add the numbers (for example, XII is ten + one + one = twelve). When a larger numeral follows a smaller one, you subtract the numbers (for example, IV is five - one = four, and XL is fifty - ten = forty).