The opposite of 81 is a number that have same absolute value as 81 but different sign.
Draw a number line to determine the opposite of 81.
The absolute values of 81 and is same.
The opposite of 81 is .
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![\"absolute](\"/userfiles/image/Library/Pre_Algebra/absolute_value_opposite_number_81.gif\")
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is same..![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=c1514dcf5c9370d5d0f83503cfa02d9e.png\")
.