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1794, literally something added, from Latin addendum, neuter of addendus that which is to be added, gerundive of addere (see add (v.)). Classical plural form is addenda.
  An addend is one of the numbers in an addition problem that isn't the solution (sum). For example: 2 + 3 = 5 2 and 3 are both addends.n any addition sum, such as 3 + 4 = 7, the addends, otherwise known as summands, are the numbers which are to be added together to create the sum. Addends are what you add to â¦ create the final answer (the sum). For example, in the problem 9+8=17, 9 and 8 are the addends and 17 is the sum. 7 people found this useful.