What is 99 minus 19 in Roman numerals giving step by step reasons for your answer?

Answer 1

There are many ways Romans have written (or thought to have written) their numerals. One way is the long way>

99 = LXXXXIX

19 = XIX

Subtracting gives us the LXXX, or 80

Notice how there is no possibility of getting decimal points wrong!

Improved Answer:-

In accordance with today's rules governing the Roman numeral system 99 and 19 converted into Roman numerals are XCIX and XIX respectively which makes arithmetical operations of these numerals difficult to undertake.

But the Romans themselves would have probably wrote out 99 and 19 as IC and IXX respectively because:-

IC is a simplification of LXXXXVIIII (-1+100 = 99)

IXX is a simplifiction of XVIIII (-1+20 = 19)

So: LXXXXVIIII - XVIIII = LXXX = XXC when simplified.

Alternatively: IC - IXX = XXC (-20+100 = 80)

Roman numerals: M=1000, D=500, C=100, L=50, X=10, V=5, I=1 and S=1/2

Footnote: The Latin word for IC is "undecentum" which means 1 from a 100 and the Latin word for IXX is "undeviginti" which means 1 from 20.

Answer 2

99 minus 19 in Roman numerals is LXXX (80) because 99 is XCIX (90) and 19 is XIX (19). Subtracting XIX from XCIX leaves LXXX.