119 LearnersLast updated on May 26th, 2025
87 in Roman Numerals
Roman numerals are a way of expressing numbers using symbols. The symbols used are I, V, X, L, C, D, and M. Roman numerals are often seen in royal titles, book names, sequences, and more. Here, we will discuss Roman numerals, their rules, and examples.
Basic Rules for 87 in Roman Numerals
There are certain basic rules to write a number in Roman numerals. In this section, let’s discuss some basic rules that need to be remembered when writing a number in Roman numerals.
Rule 1: Addition Method
The addition method is used when a smaller numeral is placed after a larger numeral. For example, LXXXVII → L + XXX + VII → 50 + 30 + 7 = 87.
Rule 2: Repetition Method
To write larger numbers, certain Roman numerals can be repeated up to three times. For example, XXX → 30.
Rule 3: Subtraction Method
If a smaller numeral is placed before a larger numeral, the smaller numeral is subtracted from the larger numeral. For example, IX → X - I → 10 - 1 = 9.
Rule 4: Limitation Rule
The symbols cannot be repeated more than three times, and some symbols like V, L, and D cannot be repeated. For example, we don't write LL for 100; instead, we use C.
How to Write 87 in Roman Numerals
Let’s now learn how to write 87 in Roman numerals. Follow these methods to write the number in Roman numerals.
- By Expansion Method
- By Grouping Method
87 in Roman Numerals by Expansion Method
In the expansion method, based on the place value, the number is broken down. In this section, we will learn how to write 87 in Roman numerals using the expansion method.
To write 87 in Roman numerals, follow the steps:
Step 1: Break the number based on place value: tens and ones.
For 87, we write it as 50 + 30 + 7.
Step 2: Convert each part into Roman numerals:
- 50 in Roman numerals is L.
- 30 in Roman numerals is XXX.
- 7 in Roman numerals is VII.
Step 3: Combine the Roman numerals:
- Therefore, 87 in Roman numerals is L (50) + XXX (30) + VII (7) = LXXXVII.
Numbers Related to 87 in Roman Numerals
Roman numerals follow a certain pattern, making them look similar. In this section, we will learn some numbers related to the Roman numeral 87.
- LXXXVI = 86
- LXXXVII = 87
- LXXXVIII = 88
- LXXXIX = 89
- XC = 90
Common Mistakes and How to Avoid Them in 87 Roman Numerals
Students make mistakes when writing a number in Roman numerals. To master Roman numerals, we can learn a few common mistakes and ways to avoid them.
Mistake 1
Errors in the repetition method
The repetition method can be confusing for beginners, as it states that Roman numerals cannot be repeated more than three times. In contrast, some numerals, such as V, L, and D, cannot be repeated.
Mistake 2
Subtracting the wrong numerals
Confusing the subtraction method can lead to errors, such as writing IL for 49 instead of XLIX.
Mistake 3
Incorrect grouping
When writing a number in Roman numerals, we should group the number correctly. For example, 8 is written as VIII, not IIIIIIII.
Mistake 4
Confusing Arabic and Roman numerals
Students may confuse Arabic and Roman numerals. To avoid such errors, students need to understand the basic concepts. Arabic numbers use the system 1, 2, 3,..., whereas Roman numerals use symbols such as I, V, X, L, etc.
Mistake 5
Confusing subtraction and addition
Students may confuse the addition and subtraction methods. When a large numeral follows a small one, we use the addition method; when a smaller numeral precedes a large one, we use the subtraction method. For example, IV = V - I = 5 - 1 = 4, whereas XV is 15, as X (10) + V (5) = 15.
87 in Roman Numerals Examples
Problem 1
Find the sum of LXXXVII and XIII.
The sum of LXXXVII and XIII is C.
Explanation
In Roman numerals, LXXXVII is 87 and XIII is 13. The sum of LXXXVII and XIII is 87 + 13 = 100. 100 in Roman Numerals can be written as C.
Problem 2
A museum has DCCLXVIII artifacts and plans to distribute them equally among IX exhibits. How many artifacts will each exhibit receive?
Each exhibit will receive LXXXVII artifacts.
Explanation
To find the number of artifacts each exhibit receives, divide the total number of artifacts by the number of exhibits: DCCLXVIII / IX.
DCCLXVIII = 768, IX = 9.
Therefore, 768 / 9 = 87.
87 in Roman numerals is LXXXVII.
Problem 3
Find the product of XXIX and III.
The product of XXIX and III is LXXXVII.
Explanation
In Roman numerals, XXIX is 29 and III is 3. The product of XXIX and III is 29 × 3 = 87. 87 in Roman Numerals can be written as LXXXVII.
Problem 4
What is the difference between CC and CXIII?
The difference between CC and CXIII is LXXXVII.
Explanation
Subtracting two numbers gives us the difference.
CC = 200, CXIII = 113.
200 - 113 = 87.
87 in Roman numerals can be written as LXXXVII.
Problem 5
Write the Roman Numeral for 34 + 53 using the expansion method.
The Roman numeral for 34 + 53 is LXXXVII.
Explanation
Convert the numbers 34 and 53 into Roman numerals.
34 = XXXIV
53 = LIII
Add the numbers together: 34 + 53 = 87
Using the expansion method: 87 = 50 + 30 + 7 = LXXXVII.
FAQs on 87 in Roman Numerals
1.What is 9 in Roman numerals?
2.How to write 87 in Roman numerals?
3.What is 16 in Roman numerals?
4.Is LXXXVII a prime number?
5.What are the multiples of 87?
6.How can children in Philippines use numbers in everyday life to understand 87 in Roman Numerals?
7.What are some fun ways kids in Philippines can practice 87 in Roman Numerals with numbers?
8.What role do numbers and 87 in Roman Numerals play in helping children in Philippines develop problem-solving skills?
9.How can families in Philippines create number-rich environments to improve 87 in Roman Numerals skills?
Important Glossaries for 87 in Roman Numerals
- Addition rule: The addition method is used when a larger numeral is followed by a smaller numeral, and the values are added. For example, LXXXVII = L + XXX + VII = 50 + 30 + 7 = 87.
- Grouping method: Here, the given number is grouped based on its place value and then converted into Roman numerals. For example, 87 = 50 + 30 + 7 = LXXXVII.
- Repetition rule: Certain symbols (I, X, C, M) in the Roman numeral system can be repeated only up to three times. For example, XXX = 30 (X is repeated three times to represent the number 30).
- Subtraction rule: The subtraction method is used when a smaller numeral precedes a larger numeral. For example, IX = X - I = 10 - 1 = 9.
- Limitation rule: Some symbols like V, L, and D cannot be repeated. For example, VV is not used for 10; instead, X is used.
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About BrightChamps in Philippines
Hiralee Lalitkumar Makwana
About the Author
Hiralee Lalitkumar Makwana has almost two years of teaching experience. She is a number ninja as she loves numbers. Her interest in numbers can be seen in the way she cracks math puzzles and hidden patterns.
Fun Fact
: She loves to read number jokes and games.
