Roman Numerals 1 to 20

Roman Numerals use symbols to represent number systems. Ancient Romans used the letters I, V, X, L, C, D, and M to represent the number system. The unavailability of zero at that time and the lack of other mathematical operations made Roman Numerals less practical in recent times. For example, we write 15 as XV.

Roman numbers are used today in clocks, chapters in books, classrooms, etc. The following chart helps us to understand the numerals better.

List of Roman Numerals 1 to 20

The list of Roman Numerals provides an organized way to understand how those letters combine to represent a number. The given list starts from I (1) to XX (20). Learning these numerals helps you in a deeper understanding of the numerical system. Roman Numerals from 1 to 10 Roman Numerals from 11 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.

Roman Numerals follow rules to make sure the number is written correctly. Here are some main rules given below:

• Rule 1: Addition Method
  
   
• Rule 2: Repetition Method
  
   
• Rule 3: Subtraction Method
  
   
• Rule 4: Limitation Rule

Rule 1: Addition Method:

In Roman Numerals, if the smaller numeral comes after the large numeral, then we need to add their values.

Example: If the given number is XII. We can see that the number X refers to 10 and the other number refers to 2. So in this, the smaller numeral is after the large numeral, so we need to add the 10 and 2 to get the value 12.

Rule 2: Repetition Method:

The Roman Numeral can be repeated up to three times to increase its value. The numbers cannot be repeated after three times. Only symbols like I and X can be repeated, and V cannot be repeated.

Example: XXX = 10 + 10 + 10 = 30, repeating the numeral X for the fourth time is not allowed.

Rule 3: Subtraction Method:

If the smaller numeral comes before the large numeral, then we need to subtract the smaller numeral from the larger numeral to get the number. There are three rules in subtraction, they are: I can be subtracted from V and X. X can be subtracted from L and C.

Example: In the number IV. Here, V is the biggest numeral and I is the smallest numeral. As we see that the smaller numeral is before the larger numeral, we need to subtract to get the number. V (5) - I (1) = IV (4).

Rule 4: Limitation Rule:

Roman Numerals consist of several limitations, they are: A numeral cannot be repeated more than three times.

For example, III (3) cannot be repeated more than 3 times, instead, we use IV for writing 4. Subtraction cannot be done with the non-pair numbers.

For example, XI here X (10) - I(1) gives IX is applicable, but IC, C (100) - I(1) is not applicable. Only one subtraction can be allowed in one numeral.

For example, XL (40), L (50) - X (10) is applicable to get 40 but XXL is not applicable to get the number 30.

Roman Numerals are fun to learn and easy to write when you know the following tips and tricks.

• Memorize the basic symbols like I (1), V (5), and X (10), to write and read the other numerals easily.
  
   
• Always break the big numerals into smaller parts to make it easier to read and write.
  
   
• Remember the repetition rule, a number should not be added more than three times.
  
   
• Practice the smaller numerals and gradually move to the bigger values. We use numerals in clocks, classrooms, etc., and try to read from the numeral clock to make numerals easy to learn.

• Breaking Numbers: It is the process of splitting a larger number into smaller parts. For example, for multiplying 15, we can divide it as 10 + 5.

• Repetition: Using the same symbols more than once. For example, XXX.

• Numerical System: The numbers, used in ancient Rome, used Latin letters rather than digits. For example, I, II, III, etc.

• Addition Method: Adding smaller numerals after larger numerals to get a sum.

• Subtraction Method: Placing a smaller numeral before a larger one, indicating subtraction.