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#### Online Quiz (WorksheetABCD)

Questions Per Quiz = 2 4 6 8 10

• D, L, or V may each only appear at most one time in the string
• M, C, X, or I may appear no more that three times consecutively in the string
• The following pairs of letters are invalid in all cases: IL, IC, ID, IM, XD, XM, VX, VL, VC, VD, VM, LC, LD, LM, DM.
• Once a letter has been subtracted from, neither it nor its "5 counterpart" may appear again in the string - so neither X nor V can follow IX, neither C nor L may follow XC, and neither M nor D may follow CM.
• Once a letter has been used as a subtraction modifier, it cannot appear again in the string - so C cannot follow CD or CM, X cannot follow XL or XC, and I cannot follow IV or IX.
• Once I, X, or C (or their "5-counterparts" V, L, and D) appears in a string, the I, X, or C cannot subsequently be used as subtraction modifiers - so IV or IX cannot follow I or V, XL or XC cannot follow X or L, and CD or CM cannot follow C or D.
Example: What is the Hindu Arabic equivalent of XCII?
X - 10
C - 100
II - 2
X before C implies 100 - 10
Hence 90 + 2

Example: What is the Hindu Arabic equivalent of VD?

More examples:
 Numeral Roman Numeral Roman 150 CL 200 CC 300 CCC 400 CD 600 DC 700 DCC 800 DCCC 900 CM 1000 M 1600 MDC 1700 MDCC 1900 MCM

Directions: Write the corresponding Hindu Arabic numbers for the following. Also write at least 10 examples of your own.
 Q 1: What is the modern equivalent for the roman numeral VC?90not valid95 Q 2: What is the roman number for 487?CDLXXXVIIXDLXXXVII Q 3: What is the modern equivalent for the roman numeral CCCXXV?Answer: Q 4: What is the modern equivalent for the roman numeral DCCXX?Answer: Q 5: What is the roman number for 842?DCCCXLIICCMXLII Q 6: What is the roman number for 650?LDCDCLCLD Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!