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Theory: Converting Hindu–Arabic numerals to Roman numerals

Task

What Roman number corresponds to the number 78?

Solution

 

 

\(\displaystyle tens\) \(\displaystyle ones\)  
\(\displaystyle 70\)\(\displaystyle +\)\(\displaystyle 8\)\(\displaystyle =\)\(\displaystyle 78\)
\(\displaystyle {\rm LXX}\)\(\displaystyle +\)\(\displaystyle {\rm VIII}\)\(\displaystyle =\)

\(\displaystyle {\rm LXXVIII}\)

Answer: \(\displaystyle {\rm LXXVIII .}\)