Roman numerals calculator
Roman numerals are based on seven symbols (IVXLCDM). A smaller number in front of a larger number means subtraction, and 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 99 is XCIX, 90 + 9, but it should never 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 a decimal.  Addition of Roman numbers
Added together and written as decimal numbers: 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 Zdenek one point less than Jirka. Find out how many points Zdenek got.  Classmates
Roman is ranked 12th highest and eleventh lowest pupil. How many classmates does Roman have?  Roman numerals 2
Subtract 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 save 10 cents. How many cents did Roman save during the entire month he started saving on April 1?  A marathon
Trevion is training for a marathon. In February, he ran XLVII miles for his training. In January, he was only able to run XXIV miles. How many more miles did he run in February than in January?  Supporting 82880
Roman and Mathias made a swing in the park by taking a 5 mlong pole and supporting it in the middle. Roman, weighing 52 kg, sat down at the left end. Where should Mathias sit to achieve balance if he weighs 60 kg? Enter the distance measured in meters fr  Long bridge
Roman walked on the bridge. When he heard the whistle, he turned and saw Kamil running at the beginning of the bridge. They would meet in the middle of the bridge if he went to him. Roman rushed and did not want to waste time returning 150m. He continued  Mathematicians 11761
The top five mathematicians in the class took on the teacher's help calculating the paper's average grade. They dictated the following results: Mischa: "I came up with 3.30. " Dasha: "That's weird because it worked out precisely 3.45. " Jana: "You probabl  Fourdigit 10261
Roman likes magic and math. Last time he conjured three or fourdigit numbers like this: • created two new numbers from the given number by dividing it between digits in the place of hundreds and tens (e.g., from the number 581, he would get 5 and 81), •  The Roman
The Roman numerals are read from left to right, using an additive system (such as the case in VII = 7) and a subtractive system (such as the case in IX = 9). How would you explain to your learners how they should decipher the following Roman numerals: MMX
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