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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.
Simply put, an addend is one of the numbers in an addition math sentence that is being added. In the math sentence 2+3=5 the numbers 2 and 3 are addends while the number 5 is the sum.Often, when we are teaching young learners about addition sentences we refer to part/part/whole.So, in the above example, 2 and 3 are parts and they add together for the whole of 5.A fancier way of saying part/part/whole would be addend/addend/sum. All of this is important because we are trying to get young learners to think algebraically.o, in the above example, 2 and 3 are parts and they add together for the whole of 5. A fancier way of saying part/part/whole would be addend/addend/sum. All of this is important because we are trying to get young learners to think algebraically.