Addition and subtraction can be performed on measurements with the same type of unit (except temperature) or with constants. If the units are not the same type, the result will not have a unit assigned to it. If necessary, the second operand's units will be converted to the first operand's units.
For example,
Multiplication can be performed on two lengths to generate an area.
Also, an area divided by a length produces a length. The and
functions can also be
used for these calculations.
For example,
Units are preserved through the following numeric functions: ,
,
,
, and
.