Basic Fundamentals

Analyze the patterns and solve the equations!

1) Solve
723
2) Solve
DCCXCIII
3) Solve
DCXCIX
4) Solve
DCCLVI
5) Solve
DXXVIII
6) Solve
287
7) Solve
CMLXVII
8) Solve
287
9) Solve
965
10) Solve
CCCXI
11) Solve
47
12) Solve
CIX
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