+pi and -pi ,or any + and - number pair that are the same distance from 0 such as 19 and -19, which are 19 units from 0, and are therefore both 19.
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A positive and negative number with the same magnitude (value) will have their absolute values equal.
That is false. A negative times a negative is always a positive. Since absolute numbers are always positive if you make it negative that is not correct.
First, subtract the absolute values of the integers, then use the greater absolute value's sign.
This is not strictly true, because an absolute value, and hence the product of two absolute values can be zero. It is, therefore true to say that the product of two absolute values is always non-negative. An absolute value of a number is, by definition, non-negative. And by the definition of multiplication, the product of two non-negative numbers in non-negative.
To add a negative number and a positive number: -- Find the difference of their absolute values (their sizes, ignoring their signs). -- Give it the same sign as whichever of the original two numbers had the larger absolute value.