2.5.1 Arithmetic Operators Arithmetic operators can be applied to numeric constants and Rexx variables that evaluate to valid Rexx numbers. The following operators are listed in descreasing order of precedence: - Unary prefix. Same as 0 - number. + Unary prefix. Same as 0 + number. ** Power * Multiply / Divide % Integer divide. Divide and return the integer part of the division. // Remainder divide. Divide and return the remainder of the division. + Add - Subtract.