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Subtraction works in much the same way:

0 − 0 = 0

0 − 1 = 1 (with borrow)

1 − 0 = 1

1 − 1 = 0

One binary numeral can be subtracted from another as follows:

*   * * *   (starred columns are borrowed from)

1 1 0 1 1 1 0

−     1 0 1 1 1

= 1 0 1 0 1 1 1

Subtracting a positive number is equivalent to adding a negative number of equal absolute value; computers typically use two's complement notation to represent negative values. This notation eliminates the need for a separate "subtract" operation. The subtraction can be summarized with this formula:

A - B = A + not B + 1

For further details, see two's complement.