Subtractio
Subtractio (-ionis, f.) est operatio arithmetica.
Operatio contraria est additio. A Romanis plerumque verbo deducendi designabatur.
Subtractio est additio numeri negativi.
In scholis discipuli primo additionem, deinde subtractionem discunt.
Formula: minuendus (+) - subtrahendus = differentia
Exempla
Exemplum: de tredecim novem sunt quattuor.
Scribe recenti more: 
Exemplum ex litteris:
- "Hythlodaeus narravit, Amauroticum pontem quingentos habere passus in longum. Iohannes ait detrahendos esse ducentos [passus]: latitudinem fluminis haud supra trecentos ibi continere." Ex Utopia Thomae Mori
Nexus externus
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