The number being subtracted from another number in a subtraction problem. In the expression 10 - 4 = 6, the number 4 is the subtrahend.
From Latin 'subtrahendus' meaning 'to be drawn away,' from 'subtrahere' (to draw from below or take away). The term entered mathematical vocabulary in the 17th century as formal arithmetic notation developed.
Unlike addition where both numbers play equal roles, subtraction creates an asymmetry - the subtrahend is the 'taker away' while the minuend is what's being diminished. This asymmetry is why subtraction isn't commutative (3 - 5 ≠ 5 - 3), making it fundamentally different from addition despite being its inverse operation!
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