# Grade 5, Maths Olympiad (CBSE) - Roman numbers

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Grade 5 | Maths | Roman numbers, Numerals and Numbers, Olympiad, CBSE, ICSE, SOF, ITO

**Roman Numbers**

Number system which we use generally is called the **arabic number system. I**t consists of digits like 1, 2, 3, 4, 5....9 etc.

Roman numbers is another number system. Numbers are represented as I, II, X etc.

**Rules:**

- I means 1, II means 2 and III means 3.
- V is 5, X is 10.
- L is 50, C is 100, D is 500 and M is 1000.
- One symbol cannot be used continuously 3 times in a row.
- Only I, X, C and M can be repeated. V, L and D cannot be repeated.
- If we place a symbol of smaller value before another symbol of greater value then we have to subtract the smaller number from bigger number.

**E.g.**

IV means 5 - 1=4 - Only one number can be subtracted from another number.
**E.g.** IIX is incorrect. - If we place a symbol of smaller value after another symbol of greater value then 2 numbers are added.

**E.g.**

VII means 5 + 2=7 - Repeated symbols are added. E.g. XX=10 + 10=20
- Bigger numbers can be represented by adding a bar at the top of the symbol which means the value of the number is multiplied by 1000.

E.g.

_

L=50 X 1000=50000

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