How to multiply Roman numerals? How to multiply Roman numerals? I need an algorithm of multiplication of numbers written in Roman numbers. Help me please.
Make a table with two columns, and enter the two numbers to be multiplied into the first row. 
Make the next row by halving the first number (discarding remainders) and doubling the second. Continue until there is nothing left to halve. 
Cross out all the rows where the left number is even. 
Add the remaining numbers in the second column. The result is the product of the first two numbers

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Source
It is conversion to Hindu numerals, Not Arabic. Just because Europeans learnt from Arabs does not mean the founders change!

https://rbutterworth.nfshost.com/Tables/romanmult is one place multiplication is explained