Last updated on May 26th, 2025
Roman numerals are a system of expressing numbers using symbols such as I, V, X, L, C, D, and M. They are used in various contexts, including royal titles, book names, and sequences. In this guide, we will discuss the Roman numeral system, its rules, and examples related to the number 879.
Royal titles often use Roman numerals, such as Henry VIII or Louis XIV. Have you noticed these symbols and wondered what they represent? They are Roman numerals, a numbering system used by ancient Romans.
The symbols I (1), V (5), X (10), L (50), C (100), D (500), and M (1000) enable counting. In Roman numerals, we use DCCCLXXIX to represent 879, where D is 500, CCC is 300, LXX is 70, and IX is 9. Let’s explore Roman numerals and how we write them.
Writing numbers in Roman numerals involves certain basic rules. Let's discuss some key rules to remember:
When a smaller numeral is placed after a larger numeral, their values are added. For example, DCCCLXXIX → D (500) + CCC (300) + LXX (70) + IX (9) = 879.
Some Roman numerals can be repeated up to three times. For example, CCC → 300.
If a smaller numeral precedes a larger numeral, the smaller is subtracted from the larger. For example, IX → X (10) - I (1) = 9.
Symbols cannot be repeated more than three times, and certain symbols like V, L, and D cannot be repeated. For example, 10 is written as X, not VV.
Let’s learn how to write 879 in Roman numerals using different methods:
The expansion method breaks down a number based on place value into hundreds, tens, and ones. Here's how to write 879 in Roman numerals using this method:
Step 1: Break the number into its place values: 800 + 70 + 9.
Step 2: Convert each part into Roman numerals: 800 → DCCC 70 → LXX 9 → IX
Step 3: Combine them: DCCC + LXX + IX = DCCCLXXIX.
When writing a large number in Roman numerals, we group the number. To write 879 in Roman numerals, group it as 800 + 70 + 9:
So, 879 is written as DCCCLXXIX in Roman numerals.
When writing numbers in Roman numerals, students often make mistakes. Here are some common errors and how to avoid them:
A historian wants to split a collection of DCCCXC ancient coins evenly among IX museums. How many coins does each museum receive?
Each museum receives XCVIII coins.
To find the number of coins each museum receives, divide the total number of coins by the number of museums.
DCCCXC = 890
IX = 9
DCCCXC / IX = 890 / 9 = 98
98 in Roman Numerals is XCVIII.
A library received CMXLVII books and decided to donate them to V schools equally. How many books does each school get?
Each school receives CLXXXIX books.
To find the number of books each school receives, divide the total number of books by the number of schools.
CMXLVII = 947
V = 5
CMXLVII / V = 947 / 5 = 189
189 in Roman Numerals is CLXXXIX.
Calculate the total cost if a merchant buys DCCLXXXIX items for IX coins each.
The total cost is DCCCI.
To find the total cost, multiply the number of items by the cost per item.
DCCLXXXIX = 789
IX = 9
789 × 9 = 7101
7101 in Roman Numerals is DCCCI.
A sculptor created a statue weighing DCCCXL kg and later added more material weighing XXXIX kg. What is the statue's total weight now?
The total weight of the statue is DCCCLXXIX kg.
To find the total weight, add the weights of the original and added materials.
DCCCXL = 840
XXXIX = 39
840 + 39 = 879
879 in Roman Numerals is DCCCLXXIX.
Write the Roman Numeral representation for the subtraction of CM from DCCCLXXIX using the expansion method.
The Roman numeral for DCCCLXXIX - CM is DCCCLXXIX.
Step 1: Convert the numbers into Roman numerals.
CM = 900
DCCCLXXIX = 879
Step 2: Subtract the numbers.
879 - 900 = -21 (negative) Since Roman numerals do not represent negative numbers, the subtraction cannot be represented traditionally.
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.
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