45 in Roman Numerals = XLV
Forty-five is written XLV in Roman numerals. The subtractive rule works once in XLV, in XL for 40: a smaller glyph placed before a larger one is taken away rather than added, which keeps XLV shorter than stacking strokes would.
What is 45 in Roman numerals?
How XLV is formed
Reading left to right, 45 breaks into these additive parts. Each Roman symbol is added in turn to reach the total.
XL + V = 40 + 5 = 45.
The shape of XLV
- Written out, XLV runs 3 characters, against 4 for 44 (XLIV) and 4 for 46 (XLVI).
- One pair inside XLV is subtractive: XL makes 40 by putting the smaller glyph first. The rest of the numeral is plain addition.
- 45 sits in the XL band: every numeral from 40 to 49 opens with XL, and the V after it carries the last 5.
- XLV uses 3 different symbols and repeats none of them: one appearance each.
Where 45 in Roman numerals is used
- Chapter, act or appendix numbering in books and plays.
- Super Bowl XLV and other numbered championship events.
- Outlines, exam questions and list items in formal documents.
Good to know about 45
- Super Bowl XLV was played in 2011; the NFL numbers its championship in Roman numerals (with the one-off exception of Super Bowl 50).
Convert another number
45 is written XLV in Roman numerals.
Frequently asked questions
How do you write 45 in Roman numerals?
Write 45 as XLV, combining XL + V. Start from the largest value that fits and work down until nothing is left over.
Why is 45 not written XXXXV?
XLV uses the subtractive rule: a smaller symbol placed before a larger one is taken away, so you never repeat a symbol four times. XXXXV breaks that rule, which is why XLV is the only correct form.
Which Super Bowl is XLV?
Super Bowl XLV is the 45th Super Bowl, played in 2011. The NFL sets its championship number in Roman numerals, which is why so many people look up values like XLV.
How is XLV broken down?
XLV breaks down as XL (40), V (5), so XL + V = 40 + 5 = 45.