An addend is a math term that refers to any number or term that is added to another number or term to form a sum. For example, in the addition problem 7 + 3 = 10, 7 and 3 are addends, and 10 is the sum. Similarly, in the problem 2x + 3y = 7, 2x and 3y are addends. The term "addend" is often used interchangeably with "summand".