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 \(₹ 525.50\).
 
Many sentences like these, we use in our daily life.

Do you know what numbers are \(80.50\) and \(2.30\)?

These numbers are called decimal numbers.
A decimal number consists of two parts; a whole number part and a decimal part.
These parts are separated by a little dot or point (.) known as a decimal point.
The left side of the decimal point is known as the whole number part.

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

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