How to read and write roman numerals?

Hundreds of year ago, the Romans had a system of numbers which had only
seven symbols. Each symbol had a different value and there was no symbol
for 0.

The symbol of Roman Numerals and their values are:

Romans used different combinations of symbols to write numbers using adding and subtraction.

For reading and writing numbers upto 50 we need only the first 4 symbols.

__I__ __V__ __X__ __L__

**Rules for the first five symbols**

**Multiplication Rule:**

When a symbol is repeated in succession, we multiply the value of the numeral by the number of times it is repeated.

A symbol cannot be repeated more than three times in succession.

**For example: **

II = 1 × 2 = 2

XX = 10 × 2 = 20

XXX = 10 × 3 = 30

We cannot write 40 as XXXX.

The symbol cannot be repeated more than three times.

**Addition Rule:**

Writing a smaller number to the right of a larger number means the numbers have to be added.

**For example: **

VI = 5 + 1 = 6

XI = 10 + 1 = 11

XII = 10 + 1 + 1 = 12

** Subtraction Rule:**

Writing a smaller number to the left of a larger number means that the
smaller number has to be subtracted from the larger number. The symbol 1
can be used for subtraction from V and X only. The symbol X can be
subtracted only from L and C.

**For example: **

IV = 5 - 1 = 4

IX = 10 - 1 = 9

XL = 50 - 10 = 40

The symbol V cannot be repeated or subtracted.

We do not repeat V twice to get 10. We already have a symbol for 10. So VV for writing 10 is not correct.

We do not subtract 5 from any symbol. VX is not correct.

A list of Roman Numerals and their value are given below:

**Writing Numbers in Roman Numerals:**

**For example: **

**1.** Write the Roman Numerals for 27. Break up the number into Tens and Ones.

27 = 20 + 7

Write the symbol for 20 (XX) and place the symbol for 7 (VII) after it.

27 convert roman numerals as XXVII

**2.** Write the Roman numeral number for 43.

43 = 40 + 3

Symbol for 40 XL

Symbol for 3 III

Roman Numerals for 43 is XLIII.

**Reading Roman Numerals:**

Look out for a subtraction operation. Do the subtraction before adding the numbers.

**For example: **

**1.** XXIV I = 1 V = 5 IV = 4

XX = 20

IV = 4

Hindu –Arabic numeral for XXIV is 24.

**2.** XIX IX = 9

Hindu –Arabic number for XIX = 19

**3.** XXXII

In this example no subtraction is needed.

XXX = 30

II = 2

Hindu –Arabic number for XXXII = 32

**Related Concept**

● Rules for Formation of Roman-numerals

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