45 in Roman numerals at a glance
- Roman numeral
- XLV
- Lowercase
- xlv
- Letters
- 3
- Parts
- XL · V
- Subtractive pairs
- XL
- In words
- forty-five
- Latin name
- quadraginta quinque
How XLV is built
Roman numerals are written one decimal place at a time, from the largest place to the smallest. Converting each digit of 45 separately and joining the pieces gives XLV:
| Place | Digit | Value | Numeral |
|---|---|---|---|
| Tens | 4 | 40 | XL |
| Ones | 5 | 5 | V |
Reading it back, left to right:
- XL = 40 (L minus X) → running total 40
- V = 5 → running total 45
The rules XLV follows
- Largest to smallest. XLV uses the symbols X, L and V (3 characters in all), and the values never increase from left to right except inside a subtractive pair.
- Subtraction. XL (40) is a subtractive pair: a smaller symbol in front of a larger one is taken away from it. Only six pairs are allowed — IV, IX, XL, XC, CD and CM — and XLV uses one of them.
- No repeats. Every symbol in XLV appears once in a row, which is why the numeral stays short.
Common mistakes when writing 45
- VL — wrong because V is never written before a larger symbol, so “VL” cannot stand for 45. The correct form is XLV.
- XXXXV — wrong because standard numerals never repeat a symbol four times; 40 is written XL. The correct form is XLV.
Where you will see XLV
- Championship games. Pro football numbers its championship game with Roman numerals, starting from game I in January 1967. Game XLV was played in early 2011.
- Volumes and sequels. Book volumes, conference editions, film sequels and anniversary events often carry a Roman numeral; edition XLV would be the 45th.
Numbers near 45 in Roman numerals
Frequently asked questions
How do you write 45 in Roman numerals?
45 is written XLV. Break it into XL (40), V (5) and add the parts: 40 + 5 = 45.
Is VL a correct way to write 45?
No. VL is wrong because V is never written before a larger symbol, so “VL” cannot stand for 45. The standard numeral for 45 is XLV.
What is 45 in Latin?
The Latin cardinal number 45 is “quadraginta quinque.” The Romans wrote it as XLV.
What is XLV plus one?
XLV + I = XLVI (46). Adding one can change the whole ending of a numeral, which is why it helps to convert to digits, add, and convert back.