Roman Numerals & Dates

Roman numerals, both ways, instantly. Type a number and the numeral appears. Type a numeral and the number appears. There is no convert button and no direction to choose — the two fields are the same fact seen from either side. IT EXPLAINS ITSELF Every result is broken down by place value: MCMLXXXVII is M + CM + LXXX + VII, not a wall of nine letters. And when a numeral is wrong the app names the rule rather than simply refusing — IIII repeats a symbol four times, IL is not one of the six subtractions the notation allows, and 49 is XLIX. IIII OR IV Almost every clock face ever made prints IIII. It is not a Roman numeral, and it is not a mistake either: it is a dial convention older than the subtractive rule. The app shows both, labelled, rather than pretending the question does not exist. PRACTICE THAT MARKS YOU A practice mode that sets questions in both directions and checks the…