Cardinal numbers (also called whole numbers, natural numbers, or counting numbers) are those used to count physical objects in the real world, such as

0, 1, 2, 3, 4 .....

They are integers that can be zero or positive.
They assume that the things being counted are not divisible. So we can have 4 cars, but never 3½ cars.
Formally, counting numbers are the set of all non-negative integers.

Cardinal numbers are also called counting numbers.

You may have heard something like "the average household has 1.8 children". Obviously, every family has a whole number of children.
The average is found by adding up all the children and dividing by the number of households.
Once you do that division **you no longer have a cardinal number**. That result is a statistic and is actually a
real number -
one that can have fractional parts.

When we have a set of objects, the cardinality of that set is the number of objects it contains. See Cardinality.

- What are scalars?
- Real numbers
- Integers
- Natural Numbers
- Positive numbers
- Negative numbers
- The uses of negative numbers
- Scientific notation (normal form)
- Complex numbers
- Imaginary numbers

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