**2.1 Introduction: A **number that contains a decimal point (**.**) is called a decimal number. But before understanding a decimal number you should know what **Place Value** is**.**While writing a number the **position** or the **place **of each number is of great importance.

**For eg**: In a number say 786

Starting from the extreme right, the first digit is in the **Units place**.

Moving towards left, the second digit is in the **Tens Place**.

And the digit at extreme Left is in the **Hundreds Place.**

So the number is now read as **Seven hundred eighty six**

Thus if you notice, while moving towards left, each position increases 10 times of the previous one.

Similarly while moving towards right; each position gets 10 times smaller.

And when we keep moving towards right, beyond the units place, the digit past units is 10 times smaller, that is**, 1/10 of units place**.

But before writing the digit past unit, decimal point should be written. It indicates where the unit position is. And after the decimal point the digit should be written.

So when we write

This is called a **Decimal number.**

So, as you move right from the decimal point, each value is divided by 10.

**2.1.1 How to Read and Write Decimal Numbers**

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