In the Standard Units environment, the arithmetic operators (+, -, *, /, and ^) are modified so that they perform the necessary operations on expressions with units.

Given units x and y, the properties of the five arithmetic operators are:

where r is a rational number; z is an appropriate unit from the given system; and za, zb, and z0 are appropriate multipliers.

Note: Prior to Maple 2015, units were displayed surrounded by double brackets.

with(Units[Standard]):

3*Unit('m')+7*Unit('ft');

$\frac{6417}{1250}⟦m⟧$

(3*Unit('cm'/'s'^2))*(7*Unit('g'));

$\frac{21}{100000}⟦N⟧$

-(32*Unit('m'));

$-32⟦m⟧$

1/(32*Unit('S'));

$\frac{1}{32}⟦\mathrm{\Omega }⟧$

(3*Unit('m'))^2;

$9⟦m^2⟧$

4^x;

$4^x$