347 LearnersLast updated on May 26th, 2025
1 in Roman Numerals
The Roman numeral 1 represents the number I. Roman numeral 1 is used to combine it with other numbers to get the desired number. You may have seen the use of roman numerals on tattoos, many people write their date of birth in roman numerals as tattoos to make it look cool.
What is 1 in Roman Numerals?
Roman Numerals use specific alphabets to represent the symbols of each value. The symbol I serves as the base for building the numbers. While other numbers need to be combined with I to get the desired value, roman numeral 1 stands alone. In the following section, we shall see how to apply rules to represent roman numeral 1.
Basic Rules for I in Roman Numerals
Rule 1: Addition method
In this combination, the larger number is written before the smaller numeral, and the values are added together.
Roman numeral I is combined with many other roman letters to get the required value.
Example:
1+1=I+I=II(2)
1+1+1=I+I+I=III(3)
5+1=V+I=VI(6)
10+1= X+I= XI (11)
Rule 2: Repetition Method
If a numeral is repeated for about 2–3 times (not more than 3 times), the number tends to be added together.
Example:
1+1=I+I=II(2)
1+1+1=I+I+I=III(3)
Rule 3: Subtraction method
In this combination, the larger number is written after the smaller numeral, and the values are subtracted.
Roman numeral I is combined with many other roman letters to get the required value. Subtraction in roman numerals begins from number 4 and so on wherever required.
Example:
5-1=V-I=IV(4), number 1 is placed before 5, so I is subtracted from V.
10-1=X-I=IX(9), number 1 is placed before 10, so I is subtracted from X.
Rule 4: Limitation Rule
The same symbol cannot be repeated more than 3 times, so we add or subtract numbers to get the desired numbers.
Example: 4
Instead of writing IIII we write IV(5-1).
6: Instead of writing IIIIII we write VI(5+1)
How to Write I in Roman Numerals?
We write roman numerals in methods explained below:
- Expansion method
- Grouping method
1 in Roman Numeral by Expansion Method
This method includes parting down numbers based on their place values like thousands, hundreds tens and ones respectively. Every place value is expressed in terms of roman numerals.
This method works as follows:
Extend and break down the numbers into place values.
Change the place values of numbers into roman numerals.
Merge the roman numerals to get the required value.
Example: 21
- XX (20)+I(1)
- 20= XX, 1=I
- Combining, XXI.
Example:112
- C (100)+X (10)+II(2)
- 100=C,10=X,2=II
- Combining, CXII
1 in Roman Numeral by Grouping Method
This method includes breaking down larger numerals into small parts based on their Roman numeral values. This method works as follows:
Recognize symbols: Look for numerals that should be added or subtracted together according to addition and subtraction rules, as discussed.
Breaking larger numbers into smaller ones.
Add or subtract values of the smaller values.
Example 1: XCIII
X→10
C→100
III→3
Add: (100-10)+3=93
Example 2 : LXXXVIII
L→50
XXX→X+X+X=30
VIII→V+III=8
Add: 50+30+8=88
Numbers Related to 1 in Roman Numerals
Roman numeral is an ancient method used for counting and writing numbers in the form of letters, it involves letters I, V, X, L, C, D, M. These letters are combined to form the desired values.
Numbers related to roman numeral 1 are:
- I: 1
- II:2
- III:3
- IV:4
- V:5
- VI:6
- VII:7
- VIII:8
- IX:9
- X:10
Common Mistakes and How to Avoid Them in I
While studying about I, it's common to make mistakes. You can avoid making mistakes by being more attentive, as mentioned below:
Mistake 1
Failing to understand the subtraction rule.
Students may get confused between the subtraction and addition rules.i.e., they may incorrectly misunderstand the subtraction rule, which is to write the smaller numeral before the larger numeral. To avoid this, the students should clarify and practice the rule with the right examples.
Example: should write 8 as VIII and not IIX.
1 in Roman Numerals Examples
Problem 1
Convert roman numeral 1 to Arabic number.
Answer: 1
Explanation
The Roman numeral I is equivalent to the Arabic number 1.
Problem 2
Add roman numerals, calculate the value of II+III.
Answer: 5
Explanation
II=1+1=2
III=1+1+1=3
II+III=V(5)
Problem 3
Subtract Roman numeral, Result V-II?
Answer: III
Explanation
here,
V=5,
II=2
5-2=3 = (III)
Problem 4
Conversions from Hindu-Arabic to Roman numerals.
7=VII
9=IX
5=V
3=III
Explanation
Numbers are written by combining symbols
Problem 5
Multiply Roman numerals I and IV.
Answer: IV
Explanation
here I =1 and IV, V=5 and 1=I so 5-1=4(IV). Now multiply I x IV= IV.
FAQs on 1 in Roman Numerals
1.What is rule 1 in Roman numerals?
2.What number is XXXIII?
3.Is XV a number?
4.How to write 50 in Roman?
5.How can children in Singapore use numbers in everyday life to understand 1 in Roman Numerals?
6.What are some fun ways kids in Singapore can practice 1 in Roman Numerals with numbers?
7.What role do numbers and 1 in Roman Numerals play in helping children in Singapore develop problem-solving skills?
8.How can families in Singapore create number-rich environments to improve 1 in Roman Numerals skills?
Important Glossaries for I in Roman Numerals
- Roman numerals: Numeral system used in Rome, where the numbers represent Latin Alphabets like I, X, C, M etc.
- Expansion Method: This method involves breaking down numbers into parts based on place values like thousands, hundreds, tens, or ones.
- Grouping Method: This method involves breaking down of larger Roman numerals into smaller
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