Answer
$-4.5$
Work Step by Step
The addends have different signs, so to add them, perform the following steps:
(1) Subtract the smaller absolute value from the bigger absolute value.
$|-6.8|-|2.3| = 6.8-2.3 =4.5$
(2) The sum will have the same sign as the number with the bigger absolute value.
$|-6.8|\gt |2.3|$
Thus,
$-6.8+2.3=-4.5$
