What is 89 and a half in roman numerals?

Answer 1

LXXXIX is eighty nine. I'm not sure if there is a way to represent a half or not.

Improved Answer:

In today's modern conversion it's LXXXIXS but the Romans themselves would have probably calculated 89 and a 1/2 on a abacus counting device as LXXXVIIIIS and then wrote it out as SXC (-10.5+100 = 89.5)

Evidence of converting 89 and a 1/2 into Roman numerals as SXC can be found in the book "History of Mathematics volume II" by David Eugene Smith first published in 1925.

The problem of wrongly converting Hindu-Arabic numerals into Roman numerals arises from the fact that today's rules governing the Roman numeral system were introduced during the Middle Ages and that was centuries after the demise of the Roman Empire.

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

Answer 2

There is no direct representation for the number 89.5 in Roman numerals, as Roman numerals are primarily used for whole numbers. However, 89 can be represented as LXXXIX. To indicate a half, it is common to use a dot or a line above the numeral, so 89.5 would be written as LXXXIẊ or LXXXIX̄.