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Analyze the number from right to left until you find a number one from there the digits are reversed

TWO COMPLEMENT

COMPUTER ARITMETIC

Use the most significant bit as a sing bit

ADDITION

SUBTRACTION

Addition proceeds as if

the two numbers were unsigned integers.

The result may be larger than can be held in the word size

being used. This condition is called overflow

OVERFLOW RULE: If two numbers are added, and they are both positive or

both negative, then overflow occurs if and only if the result has the opposite sign.

To subtract one number (subtrahend) from another

(minuend), take the twos complement (negation) of the subtrahend and add it

to the minuend.