LXXX
L is 50
X is 10
Putting X's to THE RIGHT of L means "add up" (To the left would mean "deduct")
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In Roman numerals CLXXV is equivalent to 175
A does not have an equivalent in Roman numerals.
80 = LXXX
The Roman numerals MMM is equivalent to 3000 in Arabic numerals.
In Roman numerals XLVII is equivalent to 47