Answer:

These are the symbols used by the ancient Romans to represent numbers, and can be seen, for example an old clock faces. Often they can be seen on old buildings to indicate when they were built, or an old tombstones giving a person's date of birth. The Romans did not use a place value system.

The basic symbols and the numbers they represent are
I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1000
Other numbers are obtained by placing these symbols beside each other, and the order in which they are placed indicates whether they are to be added or subtracted, as can be seen on a clock face. Below mentioned examples will help out in translating the Roman Numerals. Let see few of them:

If smaller numbers follow larger numbers, the numbers are added. If a smaller number precedes a larger number, the smaller number is subtracted from the larger. For example, if you want to say 1,100 in Roman Numerals, you would say M for 1000 and then put a C after it for 100, in other words 1100 = MC in Roman Numerals.

Some more examples: