Roman Numerals 1 to 20
2026-02-28 23:42 Diff
https://brightchamps.com/en-us/math/numbers/roman-numerals-1-to-20

Roman Numerals rely on specific symbols, and it has rules of addition and subtraction. The basic symbols in Roman Numerals are:

I = 1

V = 5

X = 10

Using the above symbols, we can combine the Roman Numerals for the numbers easily. There are two basic methods of writing Roman Numerals, they are:

  • By Expansion Method
  • By Grouping Method

By Expansion Method:

Through the expansion method, we break down the numbers into tens and one's parts and then convert them into numerals.

Step 1: Break the numbers into ones and tens parts.

Step 2: Write Roman Numerals for each part.

Step 3: Combine all the parts to get the numerals.

Example: For the number 19.

Step 1: Break the numbers 10 + 9 = 19

Step 2: Add Roman Numerals for each part

The Roman Numeral of 10 is X.

The Roman Numeral of 9 is IX.

Step 3: Combine all the parts 10 (X) + 9 (IX) = XIX.

Therefore, the Roman Numeral of 19 is XIX.

By Grouping Method:

The grouping method directly forms the number by combining Roman Numeral symbols directly. It uses addition and subtraction rules.

Step 1: Start writing numerals for the largest number.

Step 2: Smaller numbers are either getting added or subtracted.

Following the rule of adding and subtraction is mandatory.

Addition: smaller numeral after the larger numeral.

Subtraction: smaller numeral before the large numeral.

Example: For the number 12.

Step 1: Start with the larger numbers. While splitting, we will get 10 and 2

The Roman Numeral of 10 is X

Step 2: Add or subtract the smaller number If we add 2 to 10 it will become 12.

The Roman Numeral of 2 is II

Therefore, the Roman Numeral of 12 is XII.