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Units-Types of Units
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A unit is an amount we've agreed on to measure things.
Examples: inches, pounds, hours, liters, grams, centimeters etc.

Units may be combinations of other units, often connected by the word "per." These are called derived units.
example of derived units

To write "per" units mathematically, substitute a fraction line for the word "per."

 substitute a fraction line for the word 'per.'
Note: The order matters.

Example: Miles per hour cannot be written with hours on top.

Miles per hour cannot be written with hours on top.
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Types of Unit Systems
Working with units
Conversion from one unit to another
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