A mathematical or grammatical term referring to a number or quantity to be multiplied, or in Latin grammar, something that should be done or made.
From Latin 'faciendus' (things to be done), gerundive form of 'facere' (to do or make). This is a technical term primarily used in mathematics and classical grammar studies.
In old mathematical texts, the 'faciend' is the number you're multiplying—if you're multiplying 5 × 3, the 5 is the multiplicand and the 3 is the faciend, though modern math has mostly dropped these fancy names!
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