CXX Roman Numerals: Rules, Solved Examples & Practice Questions

CXX Roman numeral represent number 120. The basic Roman numerals used in forming CXX are C, and X where C = 100 and X = 10. To convert CXX into numbers we first have to write it in expanded form as 120 = 100 + 10 + 10 and then replace each number with its corresponding numeral as:
120 = C + X + X = CXX

CXX follows the addition rule of Roman numerals to represent the value 120. Learning Roman numeral CXX will help you to connect to ancient history, making number learning more engaging and meaningful. Let’s learn how to read, write, and convert CXX Roman Numerals in numbers with clear steps and examples.
 

Table of Contents

• How to Write CXX Roman Numeral in Numbers?
• Numbers Related to CXX Roman Numerals
• Basic Rules to Write Roman Numerals
• Solved Examples on CXX Roman Numeral
• Practice Questions on CXX Roman Numeral
• Conclusion
  
  

How to Write CXX Roman Numeral in Numbers?

To convert Roman numerals CXX to numbers, separate the symbols and apply Roman numeral rules to get the final number.

• Write each symbol according to its value: CXX= C + X + X
• Add the values together: C + X + X = 100 + 10 + 10 = 120

Hence, CXX = 120 in numbers.

Numbers Related to CXX Roman Numerals

 
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Basic Rules to Write Roman Numerals

There are 4 fundamental rules that Roman numerals follow. These rules help us in writing or converting Roman numbers correctly.

• Addition Rule: When smaller numerals follow larger ones, their values are added.
  Example: VI = 5 + 1 = 6
• Subtraction Rule: When a smaller numeral comes before a larger one, it is subtracted.
  Example: IX = 9 = 10 − 1
• Repetition Rule: Symbols I, X, C, and M can be repeated up to three times.
  Example: XXX = 30
• Non-Repetition Rule: Symbols V, L, and D cannot be repeated.
  
  

Solved Examples on CXX Roman Numeral

Example 1: Calculate the value of CXI + IX in Roman numerals.

Solution: To find the value of CXI + IX, let’s convert it first into numbers:
CXI = C + X + I = 100 + 10 + 1 = 111  and IX = 10 – 1 = 9
CXI + IX = 111 + 9
CXX = 120
CXI + IX = CXX

Example 2: Write 120 in Roman numerals.

Solution: To write 120 in Roman numerals, we first have to expand it and then replace each number with the respective symbol as:
120 = 100 + 10 + 10
120 = C + X + X
Hence, 120 = CXX

Example 3: Find the value of CXXV – V in Roman numerals.

Solution: To find the value of CXXV – V in Roman numerals, first convert it into numbers:
CXXV = 100 + 10 + 10 + 5 = 125
V = 5
Now, subtract 5 from 125: CXXV – V = 125 – 5
CXXV – V = 120
CXXV – V = CXX

 

Example 4: Find the value of CXX + XXX.

Solution: CXX = 120
XXX = 30
120 + 30 = 150

150 in Roman numerals = CL

Therefore, CXX + XXX = CL

Example 5: Divide CXX by X.

Solution: CXX = 120
X = 10
120 ÷ 10 = 12

12 in Roman numerals = XII

Therefore, CXX ÷ X = XII

Practice Questions on CXX Roman Numeral

1. Fill in the blank: CXX = ______ (in numbers).
2. Fill in the blank: ______ = CXX (in Roman numerals).
3. True or False: CXX represents 110.
4. Choose the correct option: The value of CXX is
   (a) 100
   (b) 110
   (c) 120
   (d) 130
5. Complete the sequence: CX, CXX, ______, CXL.
6. Fill in the blank: CXX + X = ______ (in Roman numerals).
7. True or False: CXX − XX = C.
8. Choose the correct Roman numeral for 125:
   (a) CXX
   (b) CXXV
   (c) CV
   (d) CXV
9. Complete: CXX ÷ X = ______ (in numbers).
10. Fill in the blank: The number just before CXX is ______ (in Roman numerals).
    
    

Conclusion

Ancient Romans used a unique number system called Roman numerals centuries ago. We can still see the Roman numerals used around us in many things, including clocks, books, movies, etc. Converting Roman numerals into numbers is an important skill. By learning to convert CXX Roman numerals, you can convert Roman numerals ea