Definition: Decimals, also known as Decimal Fractions, are the one in which Fractional Part and Whole Number Part are separated by a DOT.
4.25, 989.101, 8873.9, 345.12 all are the examples of a Decimal.
Following are the some topics related to Decimals.
Decimal Point
Place Values of Digits in Decimals
Expanded Form of Decimals
Read Decimals
Decimal Places
Convert Decimal to Fraction
Convert Decimal to Mixed Fraction
Convert Decimal to Lowest Fractional Form
What are Like Decimals
What are Unlike Decimals
Distinguish between Like and Unlike Decimals
How to Compare Decimals
How to arrange decimals in Ascending Order
How to arrange decimals in Descending Order
Multiplication of Decimals
Division of Decimals
These topics can be studied from the above provided links.

