You take the value of the first, and take it away from the second, and depending on the signs that are similar (positive/negative) they can cancel and override each other.
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Ignore the signs and subtract the smaller number from the larger one.
signs are different.... Find the difference.... KEEP THE LARGER SIGN signs are the same... COMBINE AND KEEP THE SIGN
The value of the quotient of two integers with different signs is the same as if the signs were the same. Because the numbers have different signs, the quotient is negative.
When their signs are the same.
Because otherwise you would only know how to subtract and add with the same integers. Not a particularly useful skill unless just those integers turned up!