40 in Roman Numerals

Learn how to write numbers 1 to 40 in Roman numerals with explanations, a conversion chart, and a downloadable resource. Perfect for students, teachers, and curious learners.

What Are Roman Numerals?

Roman numerals are a numeral system developed in ancient Rome, used across the Roman Empire for centuries. Instead of using digits like 1, 2, 3, they used combinations of letters from the Latin alphabet: I, V, X, L, C, D, and M.

Today, Roman numerals are still used in various contexts such as clock faces, book chapters, movie sequels, royal titles, and important events like the Olympic Games and Super Bowl.

How Roman Numerals Work

Roman numerals are based on a combination of the following letters:

• I = 1
• V = 5
• X = 10
• L = 50
• C = 100
• D = 500
• M = 1000

Rules:

• Symbols are added when placed in descending order: X + I = XI (11)
• Symbols are subtracted when a smaller symbol is placed before a larger one: I before V = IV (4)

Common Mistakes to Avoid

A common mistake is writing 40 as XXXX, which is incorrect. According to Roman numeral rules, 40 is written as XL, where X (10) is subtracted from L (50).

How to Write 40 in Roman Numerals?

To write 40 in Roman numerals, break it into the following parts:

• X represents 10
• L represents 50

Roman Numerals from 1 to 40 Chart

You can also [download the PDF version] to study offline or print it out for your reference.

Basic Rules to Interpret Roman Numerals

• In Roman numerals, when a larger letter comes before a smaller one, their values are added. Example: CL – C (100) + L (50) = 150
• When a smaller letter comes before a larger one, it indicates subtraction. Example: XC – C (100) - X (10) = 90
• If a letter is repeated, its values are added together. Example: II – I (1) + I (1) = 2

However, the same letter cannot be repeated more than three times in a row, as per Roman numeral conventions.

How to Convert XL to Number?

Download Roman Numerals 1–40 PDF

Click here to download a handy PDF chart of Roman numerals from 1 to 40. Keep it on your device or print it for offline study and quick reference.

Roman Numerals from 1 to 40 Download PDF

40 in Roman Numerals Exercise

1. What is the Roman numeral for 40?

A) XXXX

B) XL

C) IL

D) LX

Answer: B) XL

Explanation: X (10) before L (50) means 50 - 10 = 40

2. What is the value of XLV?

A) 45

B) 40

C) 50

D) 35

Answer: A) 45

Also Check

• Associative Property
• Centroid of a Triangle
• Collinear Points
• Commutative Property
• Cos 0
• Hypotenuse

Explanation: XL = 40, V = 5 → 40 + 5 = 45

3. What is the Roman numeral for 90?

A) IC

B) XC

C) LXL

D) CX

Answer: B) XC

Explanation: X (10) before C (100) = 100 - 10 = 90

4. What is the value of LXXX?

A) 60

B) 70

C) 80

D) 90

Answer: C) 80

Explanation: L (50) + XXX (10 + 10 + 10) = 80

5. What is the Roman numeral for 60?

A) LX

B) XL

C) XC

D) IL

Answer: A) LX

Explanation: L (50) + X (10) = 60

6. What is the value of XIX?

A) 20

B) 19

C) 21

D) 18

Answer: B) 19

Explanation: X (10) + IX (9) = 19

7. Which of these is not a correct Roman numeral?

A) IIII

B) XL

C) IX

D) XX

Answer: A) IIII

Explanation: A letter can't be repeated more than 3 times

8. What is the Roman numeral for 100?

A) L

B) C

C) D

D) M

Answer: B) C

9. What does the Roman numeral LIX represent?

A) 59

B) 49

C) 69

D) 50

Answer: A) 59

Explanation: L (50) + IX (9) = 59

10. What is the Roman numeral for 29?

A) IXX

B) XIX

C) XXIX

D) IXIX

Answer: C) XXIX

Explanation: XX (20) + IX (9) = 29