Main Page | See live article | Alphabetical index In mathematics, an operand is one of the inputs of an operator. For instance, in 3 + 6 = 9 + is the operator and 3 and 6 are the operands. The number of operands of an operator is called its arity. Based on arity, operations are classified as unary, binary etc. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.