### Theory:

1. Rohit said to his father, "The cost of petrol is $$₹78.30$$ today. It is $$₹3.20$$ more than yesterday's cost".

2. I want to reduce my weight, which is $$57.6$$ $$kg$$.

3. The price of $$5$$-litre oil is $$₹635.50$$.

These are the sentences we use in daily life.

Do you know about the numbers $$78.30$$ and $$3.20$$?

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. $$230.76$$

$$230$$ is the whole number part, and $$.76$$ is the decimal part.

2. $$45.218$$

$$45$$ is the whole number part, and $$.218$$ is the decimal part.

3. $$5.13$$

$$5$$ is the whole number part, and $$.13$$ is the decimal part.

Important!
The decimal digits of a number should be read as separate digits.