Roman number for the greatest single digit number is
a) XI
b) IC
c) IX
d) ID

Hint: We need to find Roman number for the greatest single digit number. Firstly, find the greatest single digit number existing, i.e the digit less than 10. Then find the Roman number for that digit.

Complete step-by-step answer:
As we know that, the single digits range from 0 – 9. So, the greatest single digit number existing is 9. Therefore, we need to find the Roman number representation for 9.
The roman number representation for 9 is given as (10 – 1). So, we need to represent it by the roman representation of 10 and 1.
Number 10 is represented by roman numeral X and number 1 is represented by roman numeral I.
Therefore, the roman representation of 9 is IX because it is I less than X.
Hence, Roman number for the greatest single digit number is IX.

So, the correct answer is “Option c”.

Note: Roman numbers are a number system that originated in ancient Rome. Numbers in this system are represented by combinations of letters from the Latin alphabet. The table below shows representation of this number system in standard form:


The number zero does not have its own roman representation, instead it is written by number NULLA or its initial as N.