Scalars are numbers that are used to measure size, or how big or small something is. They represent the magnitude of a quantity such 12.5 miles, or 34 degrees C.

### Counting numbers

Numbers that are used to count things are not considered scalars, although you can do arithmetic with them. For example 2 apples + 3 apples = 5 apples.

For more see Counting numbers.### Identifying numbers

Identifying numbers are

*not*scalars and are used to identify something or act as an identifying label. For example a phone number, or student id number are not scalars. You cannot do arithmetic with them. For example, dividing a phone number by three has no meaning.

- 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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