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To add two integers with unlike signs: -- Find the difference between their sizes, ignoring their signs. -- Give the difference the sign of the integer with the larger size.
To add two integers with opposite signs . . . -- Ignore the signs, and write the difference between the two numbers. -- Give it the same sign as the larger original number has.
Two integerss add to zero when their absolute values are equal and they have opposite signs.
Just multiply without the sign. Then add a minus sign to the result.
Adding two numbers with different signs means subtracting the two absolute integers (without sign) and vice versa.