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  2. Subtraction - Wikipedia

    en.wikipedia.org/wiki/Subtraction

    Both these methods break up the subtraction as a process of one digit subtractions by place value. Starting with a least significant digit, a subtraction of the subtrahend: s j s j−1... s 1. from the minuend m k m k−1... m 1, where each s i and m i is a digit, proceeds by writing down m 1 − s 1, m 2 − s 2, and so forth, as long as s i ...

  3. Method of complements - Wikipedia

    en.wikipedia.org/wiki/Method_of_complements

    In grade schools, students are sometimes taught the method of complements as a shortcut useful in mental arithmetic. [3] Subtraction is done by adding the ten's complement of the subtrahend, which is the nines' complement plus 1. The result of this addition is used when it is clear that the difference will be positive, otherwise the ten's ...

  4. Casting out nines - Wikipedia

    en.wikipedia.org/wiki/Casting_out_nines

    Since we are adding 1 to the tens digit and subtracting one from the units digit, the sum of the digits should remain the same. For example, 9 + 2 = 11 with 1 + 1 = 2. When adding 9 to itself, we would thus expect the sum of the digits to be 9 as follows: 9 + 9 = 18, (1 + 8 = 9) and 9 + 9 + 9 = 27, (2 + 7 = 9).

  5. Subtractor - Wikipedia

    en.wikipedia.org/wiki/Subtractor

    The subtractor is best understood by considering that the subtrahend and both borrow bits have negative weights, whereas the X and D bits are positive. The operation performed by the subtractor is to rewrite (which can take the values -2, -1, 0, or 1) as the sum + +.

  6. Who's Missing (album) - Wikipedia

    en.wikipedia.org/wiki/Who's_Missing_(album)

    Who's Missing is a compilation of rare and previously unreleased songs by the English rock band the Who. [1] Its second part, Two's Missing, was released in April 1987. The CD was reissued in Japan on 24 December 2011 with additional bonus tracks drawn from the Japanese only bonus disc for Then and Now, as a 2-CD set together with Two's Missing.