Zero cannot be represented in Roman Numerals.
You write 151 in Roman numerals as CLI
A nought figure is not represented in Roman numerals because the values of these numerals are self evident.
The number 5 is represented in roman numerals as V or v
Roman numerals are how numbers were represented in Rome
CLI C=100 L=50 I=1
It is: (XV)CLI which means 1,000*15 +151 = 15,151
They are invalid therefore they can't be represented as Roman numerals
The number 1010 can be represented by the Roman numerals MX
The number 625 can be represented by the Roman numerals DCXXV
The number 40 in Roman numerals is represented by XL.