To make the statement \( 8 + ( ) = 0 \) true, you need to find a number that, when added to 8, results in 0.
You can set up the equation:
\[ 8 + x = 0 \]
To solve for \( x \), subtract 8 from both sides:
\[ x = -8 \]
Thus, the number that makes the statement true is \(-8\).