abs(x) = z
int(x) = z
int(x,"unit") = z
round(x,y) = z
round(x,y,"units") = z
mod(x, y) = z
quotient(x,y) = z

x may have any dimension, y has to be dimensionless 
z has the same dimension as x 
abs((1 m)) = 1 m 
sum(x,y,z,…) = z max(x,y,z,…) = z min(x,y,z,…) = z average(x,y,z,…) = z median(x,y,z,…) = z 
All items being considered in the list (x,y,…) must have identical dimensions 
z has the same dimensions as x and y 
sum((1 m),(1 m)) = 2 m 