Add without using the number line
$(- 12) + (- 15)$

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Solution

Here, both integers are negative
The absolute value of $(- 12) = | - 12 | = 12$ .
The absolute value of $(- 15) = | - 15 | = 15$ .
Sum of their absolute values $12 + 15 = 27$
Since, the sign of addend is “ $-$ ”
Therefore, $(- 12) + (- 15) = - 27 .$

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