149 LearnersLast updated on May 26th, 2025
MCMLXXIII in Roman Numerals
To meet their daily commerce and administration needs, the ancient Romans developed Roman Numerals. It used a combination of seven symbols — I, V, X, L, C, D, and M to represent numbers. Roman numerals were used to record transactions, keep track of data, and label military units. In this topic, we are going to learn about the Roman numeral MCMLXXIII.
What is MCMLXXIII in Roman Numerals?
Ancient Romans discovered that counting fingers could get very complicated after 10. So to overcome the complexity, the Roman numeric system was developed. This was widely used throughout Europe as a standard writing system until the late Middle Ages.
Seven symbols are used to represent numbers in the Roman numeric system — I, V, X, L, C, D, and M. The numerals are made up of different combinations of these symbols.
MCMLXXIII in Roman numerals can be written in number form by adding the values of each Roman numeral, i.e., MCMLXXIII = 1973. Let us learn more about the Roman numeral MCMLXXIII, how we write them, the mistakes we usually make, and ways to avoid these mistakes.
Basic Rules for MCMLXXIII in Roman Numerals
When writing Roman numerals, there are a few rules that we need to follow based on the Roman numerals we are trying to write. In this section, we will learn about the rules when writing Roman numerals and how to represent them.
Rule 1: Addition Method:
When a larger symbol is followed by a smaller symbol, we add the numerals to each other. For example, in VIII, we have 5+3=8.
Rule 2: Repetition Method:
A symbol that is repeated three times in continuation increases the value of the numeral. For example, XXX=30.
Rule 3: Subtraction Method:
We use the subtraction method when a larger symbol follows a smaller symbol. For example, XL=40 (which is 50–10).
Rule 4: Limitation Rule:
Symbols cannot be repeated more than three times, and some symbols, such as V, L, and D cannot be repeated more than once. For example, 10 is represented as X and not VV.
How to Write MCMLXXIII in Roman Numerals?
Let us learn about how to write MCMLXXIII in Roman numerals. There are two methods that we can use to write Roman numerals:
- By Expansion Method
- By Grouping Method
MCMLXXIII in Roman Numeral by Expansion Method
The breaking down of Roman numerals into parts and then converting them into numerals is what we call the expansion method. The expansion method is the breaking down of Roman numerals into numerical form and adding them to get the final number.
Step 1: Break the Roman numerals into parts.
Step 2: Now write each of the Roman numerals with its numerical digit in the place value.
Step 3: Add the numerals together.
For MCMLXXIII,
Step 1: First we break the Roman numerals. MCMLXXIII = M + CM + L + X + X + I + I + I
Step 2: Write the Roman Numerals for each part
The Roman Numeral M is 1000
The Roman Numeral CM is 900
The Roman Numeral L is 50
The Roman Numeral X is 10
The Roman Numeral I is 1
Step 3: Combine all the numbers M + CM + L + X + X + I + I + I = 1000 + 900 + 50 + 10 + 10 + 1 + 1 + 1 = 1973.
Therefore, the Roman Numeral MCMLXXIII is 1973.
MCMLXXIII in Roman Numeral by Grouping Method
Using subtraction and addition rules, we will apply the grouping method. This means we break the Roman numerals into smaller groups, which makes it easier to work with. This method groups the Roman numerals logically, and then we write the numbers for each group.
Step 1: Take the largest number and write the number for that Roman numeral.
Step 2: Write the Roman numeral using the subtraction and addition rules.
Example: Let’s take the Roman numeral MCMLXXIII.
Step 1: The larger Roman numerals are what we will begin with. Once split, the Roman numerals we get are M, CM, L, XX, and III. The numeral for M is 1000 The numeral for CM is 900
Step 2: Now we need to either add or subtract the smaller number, depending on its place. Here we add LXXIII to MCM and we will get MCMLXXIII. The Roman numeral LXXIII is 73.
Therefore, the numeral of MCMLXXIII is 1973.
Numbers Related to MCMLXXIII in Roman Numerals
We follow a pattern when it comes to writing Roman numerals. In this section, we will write some numbers related to the Roman numeral MCMLXXIII:
| Roman Numeral | Number | Breakdown |
|---|---|---|
| M | 1000 | M |
| MC | 1100 | M + C |
| MCM | 1900 | M + CM |
| MCML | 1950 | M + CM + L |
| MCMLX | 1960 | M + CM + L + X |
| MCMLXX | 1970 | M + CM + L + X + X |
| MCMLXXI | 1971 | M + CM + L + X + X + I |
| MCMLXXII | 1972 | M + CM + L + X + X + I + I |
| MCMLXXIII | 1973 | M + CM + L + X + X + I + I + I |
Common Mistakes and How to Avoid Them in MCMLXXIII Roman Numerals
Students can make mistakes when studying Roman numerals. Here are a few common mistakes students make, and ways to avoid them.
Mistake 1
Mistakes when applying the repetition method
It can be quite confusing for beginners to remember that Roman Numerals cannot be repeated more than three times. Another thing to keep in mind is that Roman Numerals such as V, L, and D cannot be repeated.
For example, writing LL as 100 is incorrect; the correct answer is C.
MCMLXXIII Roman Numerals Examples
Problem 1
Imagine a year was written in Roman numerals as MCMLXXIII. What is the sum of that year and MCMLXX? Write the answer in Roman numerals.
The sum is MMMCMXLIII
Explanation
Convert both Roman numerals into their decimal form:
MCMLXXIII = 1973
MCMLXX = 1970
Now add both numbers: 1973 + 1970 = 3943
Convert the number into its Roman numeral: 3943 = 3000 (MMM) + 900 (CM) + 40 (XL) + 3 (III) = MMMCMXLIII
Problem 2
If a historical artifact was discovered in the year MCMLXXIII and another in MDCCCLXXIII, what is the difference in years between their discoveries? Write the answer in Roman numerals.
The difference is C
Explanation
Convert the Roman numerals into their decimal form:
MCMLXXIII = 1973
MDCCCLXXIII = 1873
Now subtract the numbers, 1973 - 1873 = 100 Convert the number into its Roman numeral: 100 = C
Problem 3
A century later from the year MCMLXXIII, what would the year be in Roman numerals?
The year would be MMMLXXIII
Explanation
Convert MCMLXXIII into its decimal form:
MCMLXXIII = 1973
Add 100 years to it: 1973 + 100 = 2073
Convert 2073 into its Roman numeral: 2000 (MM) + 70 (LXX) + 3 (III) = MMMLXXIII
Problem 4
What is the product of the digits in the year MCMLXXIII if each letter is converted to its Roman numeral equivalent and multiplied together (M = 1000, C = 100, etc.)?
The product is 10000
Explanation
Convert each Roman numeral to its equivalent number:
M = 1000
C = 100
M = 1000
L = 50
X = 10
X = 10
I = 1
I = 1 Multiply the values: 1000 * 100 * 1000 * 50 * 10 * 10 * 1 * 1 = 10000
Problem 5
Convert the year MCMLXXIII from Roman numerals into its decimal form.
In decimal form, MCMLXXIII is 1973
Explanation
Break MCMLXXIII into components:
M = 1000
CM = 900
LXX = 70 (L = 50, X = 10, X = 10)
III = 3 (I + I + I)
Add values: 1000 + 900 + 70 + 3 = 1973
FAQs on MCMLXXIII in Roman Numerals
1.What is MCM in Roman numerals?
2.Is MCMLXXIII a prime number?
3.What is MCMLXXIII + MCMLXXIII?
4.What is XXXIII?
5.Subtract LXX from MCMLXXIII
6.How can children in United States use numbers in everyday life to understand MCMLXXIII in Roman Numerals?
7.What are some fun ways kids in United States can practice MCMLXXIII in Roman Numerals with numbers?
8.What role do numbers and MCMLXXIII in Roman Numerals play in helping children in United States develop problem-solving skills?
9.How can families in United States create number-rich environments to improve MCMLXXIII in Roman Numerals skills?
Important Glossaries for MCMLXXIII in Roman Numerals
- Limitation Rule: There are some symbols that cannot be repeated more than once (V, L, D). For example, LL for 100 is wrong; the correct answer is C.
- Place Value: The position of a digit in a number; this position determines its value. For example, the number 2 in 23 is in the tens place.
- Subtraction Method: A method where a smaller numeral placed before a larger numeral indicates subtraction. For example, IV is 4 (5-1).
- Addition Method: A method where a smaller numeral placed after a larger numeral indicates addition. For example, VI is 6 (5+1).
- Grouping Method: A technique of breaking down Roman numerals into smaller groups for easier calculation, following specific rules of addition and subtraction.
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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.
