Roman Numerals
The ancient Romans used the symbols given below
to represent numerals.
All other numerals are represented through
combinations of these seven different symbols.
Rules for Forming Roman Numerals
No symbol, except for M, is repeated more than
three times in a row.
When a symbol is followed by a symbol with an
equal or lesser value, addthe values of the symbols.
XX 10 10 20 CCC 100 100 100 300
DC 500 100 600 MD 1000 500 1500
When a symbol is followed by a symbol with a
greater value, subtractthe lesser value from the
greater value.
IX 10 1 9 XL 50 10 40
XC 100 10 90 CM 1000 100 900
Only subtract powers of ten (I, X, or C, but not V or L).
For the numeral 95, do NOT write VC (100 5).
Do write XCV (XC V or 90 5).
Sometimes you must add andsubtract.
MCMIV 1000 (1000 100) (5 1) 1904
CMLX(1000 100) (50 10) 960
Write each as a standard numeral.
- CL 2. XXXIX 3. MM 4. CDIX
- CMXC 6. LXVI 7. MCMXCV 8. MCLV
Write the Roman numeral for each.
0 9. 127 10. 1914 11. 4300 12. 6320
Symbol IV XL C D M
Value 1 5 10 50 100 500 1000
Think
Roman numerals I,
X, and C are
powers of ten.
I 100 X 101
C 102
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