numeric-value          A numeric literal.

    numeric-host-var       A host language variable that holds a
                           numeric value.

    numeric-db-field       A database field (qualified with a context
                           variable) that holds a numeric value.

    + - * /                Arithmetic operators. The following table
                           lists the arithmetic operators and their
                           functions.

     Operator     Function
    --------------------------
     +            Add

     -            Subtract

     *            Multiply

     /            Divide
    --------------------------