Theory:

1. Rohit said to his father, "The cost of petrol is \(₹80.50\) today. It is \(₹2.30\) more than yesterday's cost".
  
2. I want to reduce my weight, which is \(55.4\) \(kg\).
  
3. The price of \(5\) litre oil is \(₹525.50\).
 
These are the sentences we use in daily life.

Do you know about the numbers \(80.50\) and \(2.30\)?

Yes, these numbers are called decimal numbers.
A decimal number consists of two parts, which is the whole number part and a decimal part.
Both of these parts are separated by a little dot or point (.) known as a decimal point.
The right side of the decimal point is known as the whole number part.

The left side of the decimal point is known as the decimal part.
1. \(580.94\)

\(580\) is the whole number part, and \(.94\) is the decimal part.
 
2. \(64.508\)
 
\(64\) is the whole number part, and \(.508\) is the decimal part.
 
3. \(2.07\)
 
\(2\) is the whole number part, and \(.07\) is the decimal part.
 
Decimal whole.png