Operator Example Description + $a = 3 + 4; Add - $a = 3–4; Subtract * $a = 3 * 4; Multiply / $a = 3 / 4; Divide ** $a = 2 ** 4; Raise the power % $a = 36 % 8; Modulo the expression on the left of the operator by the expression on the right of the operator.