Sentence: Although a disaster decimated the city's homes, 90% of the homes remained intact.
A common incorrect sentence: Our team decimated the opponents, so we won the championship. (Please note that in this sentence, nothing was actually destroyed or reduced, it was only a win/loss situation. Please note that incorrect colloquial use does NOT make the incorrect usage correct.)
Please note that common usage tends to use this word incorrectly. A common incorrect use of the word implies: to destroy much of; kill a large part of.
Sentence: War had decimated the tribe.
In this sentence, if the war had destroyed more than 10% of the tribe, the word "devastated" should have been used. Such use of decimate is incorrect and should be avoided.