In ancient times, roman numerals were used for counting, and this counting system was developed for trading, etc. These roman numerals were developed between the 900 and 800 B.C. This number system spread all over Europe in the Late Middle Ages. Their numbers were

Romans, who nailed their history, whether it is about ruling the world, architecture, or inventions, have dropped their unforgettable marks in history. Before the roman numerals, people of that time used to count on fingers which cause many errors in counting. Romans introduced this number system to overcome counting errors.

Roman mostly uses the Rule of Thumb for counting; they had not much investment in mathematics. But this invention is remarkable, and till now, it is in use. These numbers are not in our common use but still considered as worthy, i.e., in antique clocks, roman numerals use, which gives a classic look.

Roman numerals are inscribed by combining the Latin alphabets, I, V, X, L, C, D, M. These symbols are based on the rule of thumb. These symbols represent the fingers, “I” represent the number 1 finger, “V” represent the number 5 fingers.

“I” represents the number 1

“V” represents the number 5

“X” represents the number 10

“L” represents the number 50

“C” represents the number 100

“D” represents the number 500

“M” represents the number 1000

These are the symbols used for representing the numbers, which help to write other numbers by using placement law, which means adding and subtracting these symbols can foam a new number.

Although the numbers are infinite, today we are going to talk about number IV or, as known today, as the number “4”.

**Formation of IV**

There are some rules to write numbers in roman numerals, i.e., placement of law and rule of thumb. If we observe the formation of IV, there are certain rule which roman use to write IV.

As we know, “I” represent 1 and “V” represent 5, but IV is the combination “I” and “V”. It is following the placement rule, and if the smaller number comes after the larger number, it means that there two numbers are subtracting. We can say that “I” is subtracted by “V”. in simple numbers, 5-1=4. This is how the number IV generated from I and V.

The symbol for IV is itself unique because instead of writing “IIII”, the subtraction between two symbols were used to form it. Opposite to this operation is addition. If the smaller number comes after, the larger number means the operation between these symbols is addition, and the combination is its sum.

**Rule of Roman Numbers**

Roman numbers have certain rules to foam new numbers from these symbols, which are following.

- Three letters can be written in one row to foam a number.
- For subtraction, a smaller number will be placed on the left side of the larger number.
- In addition, a smaller number will be placed on the right side of the larger number.
- The bar over the number means it can handle multiple by 1000, which is a huge number.

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