6th Grade Math Textbook, Progress

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.

1. CL 2. XXXIX 3. MM 4. CDIX


2. 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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