CXXV Roman Numerals: Rules, Solved Examples & Practice Questions

CXXV Roman numeral represent the number 125 (one hundred twenty-five). Understanding how to convert Roman numerals to numbers is a key skill for anyone interested in learning this classical numbering system. On this page, we will explain the process of converting CXXV Roman numerals into numbers comprehensively. Examples included on this page will help provide a better understanding of solving CXXV Roman numerals. 

Table of Contents

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

 

How to Write CXXV Roman Numeral in Numbers?

To write CXXV Roman numerals in numbers, we can use two different methods. 

I. Expansion Method

II. Grouping Method

Method 1: Expansion Method

• Break the CXXV Roman numerals into single letters.

• Replace each Roman numeral with its numerical value as per place value.

• Add/subtract all of these numbers to get the final value.

In this method, we have to first write CXXV in expanded form as  C + X + X + V

Now, add/subtract each number individually. i.e., CXXV= 100 + 10 + 10 + 5 = 125

Method 2: Grouping Method

In the second method, we can pair numbers in groups and then consider them for addition/subtraction. 

For instance, CXXV can be written in groups as 

C + XX + V

Now, replace each numeral with its numerical value and add: 100 + 20 + 5 = 125.

 

Numbers Related to CXXV Roman Numerals

 

Basic Rules to Write Roman Numerals 

There are important rules that should be followed to write and convert Roman numerals into numbers correctly. They involve understanding the placement and repetition of letters and symbols. As Roman numerals apply both addition and subtraction to represent numbers, it’s essential to follow the fundamental rules that govern Roman numeral construction to ensure accuracy.

• No numeral can appear more than three times in a row (e.g., XX = 20, but 4 is IV).

• Smaller numerals before larger ones indicate subtraction (e.g., IX = 9).

• Smaller numerals after larger ones indicate addition (e.g., VI = 6).

• Only certain pairs use the subtraction rule, such as:
  I before V and X
  X before L and C

These basic rules help avoid common mistakes when writing Roman numerals.

 

Solved Examples on CXXV Roman Numeral

Example 1. Write the numerical value of CXXV Roman numeral.

Solution: To write CXXV Roman numeral in numerical value, we first need to break it into smaller parts and then add them as: C + X + X + V = 100 + 10 + 10 + 5 = 125
 

Example 2. Determine the value of CXXV - CX.

Solution: We know that, 

CXXV = C + X + X + V = 100 + 10 + 10 + 5 =125

CX = C +  X = 100 + 10 = 110

So, CXXV - CX = 125 - 110 = 15

Therefore, CXXV - CX = XV

Example 3. What is the sum of C + XXIV?

Solution: C = 100 and XXV = 25, So, C + XXV = CXXV.

Example 4. Find the value of CXXV + XV.

Solution: CXXV = 125

XV = 15

125 + 15 = 140

140 in Roman numerals = CXL

Therefore, CXXV + XV = CXL

Example 5. Subtract XXV from CXXV.

Solution: CXXV = 125

XXV = 25

125 − 25 = 100

100 in Roman numerals = C

Therefore, CXXV − XXV = C

 

Practice Questions on CXXV Roman Numeral 

1. Fill in the blank: CXXV = ______ (in numbers).
2. Fill in the blank: ______ = CXXV (in Roman numerals).
3. True or False: CXXV represents 135.
4. Choose the correct option: The value of CXXV is
   (a) 115
   (b) 120
   (c) 125
   (d) 130
5. Complete the sequence: CXXIII, CXXIV, ______, CXXVI.
6. Fill in the blank: CXXV + X = ______ (in Roman numerals).
7. True or False: CXXV − V = CXX.
8. Choose the correct Roman numeral for 130:
   (a) CXX
   (b) CXXX
   (c) CXL
   (d) CXV
9. Complete: CXXV ÷ V = ______ (in numbers).
10. Fill in the blank: The number just before CXXV is ______ (in Roman numerals).
    
    

Conclusion

Roman numbers are part of an ancient number system that is still in use. It originated in ancient Rome. It uses a combination of letters and specific rules for addition and subtraction to write numbers. By learning these rules and practicing examples, students can easily interpret the Roman numerals in daily life.  

Learn Roman numerals and more interesting math concepts like CXXV in Roman numerals with Orchids The International School.