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118 Learners

Last updated on ** October 1st, 2024**

The Roman numeral 1 represents the number I. Roman numeral 1 is used to combine it with other numbers to get the desired number. You may have seen the use of roman numerals on tattoos, many people write their date of birth in roman numerals as tattoos to make it look cool.

Roman Numerals use specific alphabets to represent the symbols of each value. The symbol I serves as the base for building the numbers. While other numbers need to be combined with I to get the desired value, roman numeral 1 stands alone. In the following section, we shall see how to apply rules to represent roman numeral 1.

**Rule 1: Addition method**

In this combination, the larger number is written before the smaller numeral, and the values are added together.

Roman numeral I is combined with many other roman letters to get the required value.

**Example:**

1+1=I+I=II(2)

1+1+1=I+I+I=III(3)

5+1=V+I=VI(6)

10+1= X+I= XI (11)

**Rule 2: Repetition Method**

If a numeral is repeated for about 2–3 times (not more than 3 times), the number tends to be added together.

Example:

1+1=I+I=II(2)

1+1+1=I+I+I=III(3)

**Rule 3: Subtraction method**

In this combination, the larger number is written after the smaller numeral, and the values are subtracted.

Roman numeral I is combined with many other roman letters to get the required value. Subtraction in roman numerals begins from number 4 and so on wherever required.

**Example:**

5-1=V-I=IV(4), number 1 is placed before 5, so I is subtracted from V.

10-1=X-I=IX(9), number 1 is placed before 10, so I is subtracted from X.

**Rule 4: Limitation Rule**

The same symbol cannot be repeated more than 3 times, so we add or subtract numbers to get the desired numbers.

** Example:** 4

Instead of writing IIII we write IV(5-1).

6: Instead of writing IIIIII we write VI(5+1)

We write roman numerals in methods explained below:

- Expansion method

- Grouping method

This method includes parting down numbers based on their place values like thousands, hundreds tens and ones respectively. Every place value is expressed in terms of roman numerals.

This method works as follows:

Extend and break down the numbers into place values.

Change the place values of numbers into roman numerals.

Merge the roman numerals to get the required value.

Example: 21

- XX (20)+I(1)

- 20= XX, 1=I

- Combining, XXI.

Example:112

- C (100)+X (10)+II(2)

- 100=C,10=X,2=II

- Combining, CXII

This method includes breaking down larger numerals into small parts based on their Roman numeral values. This method works as follows:

**Recognize symbols:** Look for numerals that should be added or subtracted together according to addition and subtraction rules, as discussed.

Breaking larger numbers into smaller ones.

Add or subtract values of the smaller values.

**Example 1:** XCIII

X→10

C→100

III→3

Add: (100-10)+3=93

**Example 2 : **LXXXVIII

L→50

XXX→X+X+X=30

VIII→V+III=8

Add: 50+30+8=88

**Roman numerals:**Numeral system used in Rome, where the numbers represent Latin Alphabets like I, X, C, M etc.

**Expansion Method:**This method involves breaking down numbers into parts based on place values like thousands, hundreds, tens, or ones.

**Grouping Method:**This method involves breaking down of larger Roman numerals into smaller