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Without knowing the specific subject or sub-category of that subject it is not possible to give a numeric answer.

There are several systems of measurement each with different standard units. The most commonly used is the SI system, however, all rely on defined units and others that are derivedfrom these.

Defined units would be for such things as mass, length and time.

Derived units would be area, volume and speed.

These are only examples.

There are also units with no physical quantity which are used in certain areas which are purely comparative.

An example would be a persons IQ for instance

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Q: How many standard units are there?
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