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Whole numbers are used for counting things.
A PIN - personal identification number, which are used for credit and debit card authorisation.
Yes, whole numbers are counting numbers.The term whole number does not have a consistent definition.Well the most used definition is "counting numbers along with zero".
Decimals include a fractional part, represented by digits to the right of the decimal point, while whole numbers only have a whole part, represented by digits to the left of the decimal point. Whole numbers can be positive or negative, while decimals can also be fractions or mixed numbers. Additionally, whole numbers are used to count while decimals are used for measurement and precision.
The set of counting numbers is the positive integers. The set of whole numbers is the positive integers plus zero. The term "natural numbers" has been used interchangeably with both of those sets.