The MULTIPLY statement has the form
MULTIPLY exp1:exp2;var
and places exp1*exp2 in var. If var is omitted, exp1 must be a variable, and recieves the result of the multiplication.
The colon may be replaced by &'BY', and the semicolon by &'GIVING'.
Use of a comma instead of a colon interchanges the roles of exp1 and exp2.