To find the integer that makes the addition sentence true, we can express it as:
\( x + 893 = 506 \)
To isolate \( x \), we subtract 893 from both sides:
\[ x = 506 - 893 \]
Calculating the right side:
\[ x = 506 - 893 = -387 \]
Thus, the integer that makes the addition sentence true is:
\(-387\)