Add without using the number line:
$(- 7) + 18$

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Solution

Difference of integers:
Here, one is positive and the other is negative.
Absolute value of $(- 7) = | - 7 | = 7$ .
Absolute value of $18 = | 18 | = 18$ .
Difference in their absolute values $= 18 - 7 = 11$ .
Since, $18 > 7$ and $18$ has a $“ + ”$ sign.
Therefore, $(- 7) + 18 = 11$ .

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