Roman numerals calculator
Roman numerals are based on seven symbols (IVXLCDM). A smaller number in front of a larger number means subtraction, all else means addition. For example, IV means 4, VI means 6. You would not put more than one smaller number in front of a larger number to subtract. For example, IIV would not mean 3. You must separate ones, tens, hundreds, and thousands as separate items. That means that 99 is XCIX, 90 + 9, but never should be written as IC. Similarly, 999 cannot be IM and 1999 cannot be MIM. 

I 
The numeral one. II is two, III is three. 
V 
The numeral 5. IV is 4, VI is 6, VII is 7, VIII is 8. 
X 
The numeral 10. IX is 9, XI is 11, etc. 
L 
The numeral 50. XL would be 40. 
C 
The numeral 100. 
D 
The numeral 500. 
M 
The numeral 1000. 
Sometimes you will see a numeral with a line over it. That means to multiply it by 1000. A numeral V with a line over it means 5000. 
Roman numerals in word problems:
 Roman numerals
Write numbers written in Roman numerals as decimal.  Addition of Roman numbers
Added together and write as decimal number: LXVII + MLXIV  Roman numerals 2+
Add up the number written in Roman numerals. Write the results as roman numbers.  Roman numerals +
Add up the number written in Roman numerals. Write the results as a decimal number.  Zdeněk 4090
Petr scored 18 points, Jirka half, Roman scored 3 points less than Petr, and Zdeněk one point less than Jirka. Find out how many points Zdeněk got.  Classmates
Roman is ranked 12th highest and eleventh lowest pupil. How many classmates does Roman have?  Roman numerals 2
Subtract up the number written in Roman numerals. Write the results as Roman numbers.  Students 19423
The teacher gave the students homework to rewrite 32 words. Roman rewrote more words than he was given the task. How many words could he rewrite?  April (month)
April has 30 days. Roman saves his money in the box for the whole month. Every third day you saves 10 cents. How many cents did Roman saved during the whole month when start saving on April 1?  Long bridge
Roman walked on the bridge. When he heard the whistle, he turned and saw running Kamil at the beginning of the bridge. If he went to him, they would meet in the middle of the bridge. Roman, however, rushed and so did not want to waste time returning 150m.  Mathematicians 11761
The top five mathematicians in the class took on the help of the teacher in calculating the average grade from the paper. They dictated the following results: Mischa: "I came up with 3.30. " Dasha: "That's weird, because it worked out exactly 3.45. " Jana
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