Prescription drugs represent only about one-tenth of all health care spending in the United States.

VOA: special.2009.09.11

"Coral reefs only make up about one tenth of one percent of the ocean floor."

VOA: standard.2010.05.26

Google Play mobile games is only a tenth below the entire portable console game industry.

FORBES: Google Play Alone About To Overtake Entire Portable Console Game Market - Wake Up, Nintendo

But when he implanted only a tenth as many, the tumors almost always died out.

FORBES: Cancer Killer

He says anonymous surveys of athletes indicate that only a tenth of them use performance-enhancing drugs.

FORBES: Magazine Article