addend
Addend (noun) means In mathematics, a number or term that is added to another to make a sum. Example: “In 5 + 3, both 5 and 3 are addends.”
How to use addend
Learner’s notesIn plain EnglishAn addend is simply one of the numbers you add together.
It is a technical term, used mainly in mathematics and occasionally in chemistry.
Fill the gap
Can you complete this real example?
In 5 + 3, both 5 and 3 are _____.
Etymology
Addend is a shortened form of addendum, formed by treating the word as if it were built from add plus the ending -end.