47 in Roman numerals
XLVII
The number 47 is written XLVII in Roman numerals.
How XLVII breaks down
| Symbols | Value |
|---|---|
XL | 40 |
V | 5 |
II | 2 × 1 = 2 |
XLVII | 47 |
This numeral uses the subtractive rule: a smaller symbol placed before a larger one is subtracted from it. Only six such pairs are legal — IV (4), IX (9), XL (40), XC (90), CD (400) and CM (900).
Nearby numbers
| Number | Roman numeral |
|---|---|
| 42 | XLII |
| 43 | XLIII |
| 44 | XLIV |
| 45 | XLV |
| 46 | XLVI |
| 47 | XLVII |
| 48 | XLVIII |
| 49 | XLIX |
| 50 | L |
| 51 | LI |
| 52 | LII |
The seven symbols
I | 1 | C | 100 |
V | 5 | D | 500 |
X | 10 | M | 1,000 |
L | 50 |
47 in other notations
| Roman | XLVII |
| Binary | 101111 |
| Hexadecimal | 2F |
| Octal | 57 |
| Written out | forty-seven |
Writing it by hand
Work down through the symbol values, taking as many of each as will fit before moving to the next. For 47:
XL = 40 remaining: 7
V = 5 remaining: 2
2 × I = 2 remaining: 0The result reads XLVII — 5 characters, against 2 digits in Arabic numerals. The verbosity at numbers like this is precisely why positional notation replaced the system for arithmetic.
Frequently asked questions
What is 47 in Roman numerals?
XLVII
How do you read XLVII?
Work left to right, adding each symbol — except where a smaller symbol precedes a larger one, in which case it is subtracted. XL is 40, V is 5, II is 2, giving 47 in total.
How do you write 47 in words?
forty-seven.
Why is there no zero?
Roman numerals have no symbol for zero. The concept reached Europe only with Hindu-Arabic numerals, centuries after the system was in use — which is a large part of why it was eventually replaced for arithmetic.