When we have a set of objects, the cardinality of the set is the number of objects it contains. So for example if we have a group of 12 students, the cardinality of that group is 12.

See also Cardinal numbers.

- 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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