90 in Roman Numerals

Introduction to 90 in Roman Numerals 

90 in Roman numerals is written as XC. Roman numerals are an old system of numbers used in Ancient Rome. Instead of digits such as 1, 2, and 3, this system uses letters as in I, V, X, L, C, D, and M. Even today, Roman numerals are seen on watches, book pages, film names, and important events.

Number 90 is written as XC because X = 10 and C = 100. When a small numeral comes before a large numeral, it is subtracted. So the XC means 100 - 10, equal to 90.

Here, we will learn how to represent 90 in Roman numerals, explore Roman numerals associated with 90, and discuss solved examples for better understanding.

Table of Contents

• Definition of 90 in Roman Numerals
• How to write 90 in Roman Numerals?
• Roman Numeral Chart Around 90
• Solved Examples
• Fun Facts about Roman numeral 90
• Practice Questions
• FAQs on 90 in Roman Numerals

Definition of 90 in Roman Numerals

In Roman numerals, 90 is written as XC.Letters are used to show numbers instead of digits. The main letters are I(1), V(5), X(10), L(50), C(100), D(500), and M(1000).

To write 90, we put X (10) before C (100). When we have a smaller number that comes before a bigger number, we subtract it. So, XC = 100 – 10 = 90. This is the correct and simple way to write the number 90 in Roman numerals.

How to write 90 in Roman Numerals?

The number 90 in Roman numerals is written as XC. Let's see step by step how we get this:

• First, break the number 90 into simple form.

• 90 = 100 – 10

• Now, write the Roman numerals for these numbers.

• 100 = C  and 10 = X

• When a smaller numeral comes before a bigger numeral, we subtract it.

• So, XC = 100 – 10 = 90

Roman Numerals related to the number 90

Here are some numerals close to 90 written in Roman numerals:

• 91 = XCI (90 + 1)

• 92 = XCII (90 + 2) 

• 93 = XCIII (90 + 3)

• 94 = XCIV (90 + 4)

• 95 = XCV (90 + 5)

• 96 = XCVI (90 + 6)

• 97 = XCVII (90 + 7)

• 98 = XCVIII (90 + 8)

• 99 = XCIX (90 + 9)
  
  

Roman Numeral Chart Around 90

Solved Examples

Example 1: A shopkeeper sold 45 apples in the morning and 45 apples in the evening. How many apples did he sell in tola? Write the total in Roman numerals. 

Solution:

• 45 + 45 = 90 

• 90 in Roman numerals is XC.

Example 2: Multiply XI (11) by IX (9). Express the answer in Roman numerals.

Solution:

• XI = 11 

• IX = 9 

• 11 * 9 = 99

• So, 99 in Roman numerals is XCIX.

Example 3: What is the value of C – III in Roman numerals?

Solution:

• C = 100

• III = 3

• 100  – 3 = 97

• So, 97 in Roman numerals = XCVII.

Example 4: Multiply XV (15) by VI (6). Write the result in Roman numerals.

Solution:

• XV = 15 

• VI = 6

• 15 * 6 = 90

• 90 in Roman numerals is XC.

Example 5: Find the sum of L (50) and XL (40). Write the answer in Roman numerals.

Solution:

• L = 50 

• XL = 40

• So, 50 + 40 = 90

• 90 in Roman numerals is XC.
  
  

Fun Facts about Roman numeral 90

• 90 is written as XC: In Roman numerals, a small number added before a large number means subtraction. This is why 90 is written as XC (100 - 10).

• Used in history: Roman numerals were used in ancient Rome for counting, building numbers, dates, and even coins.

• Movies and events: Roman numerals are often used in movie titles, names of kings, or important events. 

• Easy Pattern: Numbers in the 90s follow a pattern

• 91 = XCI

• 92 = XCII

• 93 = XCIII

• And so on until 99 = XCIX
  
  

Practice Questions

1. Write 90 in Roman numerals.

2. Find the sum of L (50) and XL (40). Write the answer in Roman numerals.

3. Divide 180 by 2. Write the answer in Roman numerals. 

4. Add XX (20) and LXX (70). Write the result in Roman numerals

5. Write the next three numbers after 90 in Roman numbers.
   
   

FAQs on 90 in Roman Numerals

1. What are the Roman numerals for 1 to 100?

Roman numerals use letters to show numbers. From 1 to 100, they are written using I, V, X, L, C.

• 1 = I

• 5 = V

• 10 = X

• 50 = L

• 100 = C

Numbers between them are formed by adding or subtracting these letters, for example:

• 20 = XX

• 40 = XL

• 70 = LXX

• 90 = XC

So, all numbers from 1 to 100 can be written with these rules.

2. Why is XC 90 in Roman numerals?

In Roman numerals, when a smaller number comes before a bigger number, it means subtraction.

• X = 10 

• C = 100

• So, XC = 100 – 10 = 90. That's why 90 is written as XC. 

3. What is CX in Roman numbers?

Cx is made of:

• C = 100

• X = 10

• So, CX = 100 + 10 = 110

4. How to write Roman numbers from 90 to 100?

Here are the Roman numerals from 90 to 100:

• 90 = XC

• 91 = XCI

• 92 = XCII 

• 93 = XCIII

• 94 = XCIV 

• 95 = XCV 

• 96 = XCVI 

• 97 = XCVII 

• 98 = XCVIII 

• 99 = XCIX 

• 100 = C

5. How to write 1 to 200 in Roman numerals?

From 1 to 100, we use I, V, X, L, and C. From 101 to 200, we keep adding C(100) in front.

Examples:

• 101 = CI

• 150 = CL

• 175 = CLXXV

• 199 = CXCIX

• 200 = CC 
  
  

Explore more about Roman numerals and practice other math concepts with our free learning resources at Orchids The International School.