In Highschool Education
In grade schools, students are sometimes taught the method of complements as a shortcut useful in mental arithmetic. Subtraction is done by adding the ten's complement of the subtrahend, which is the nines' complement plus 1. The method is generally only applied when it is clear that the difference will be positive. The same technique works for subtracting on an adding machine.
Read more about this topic: Method Of Complements
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