- 31 - Exhibit (11) OWENS CORNING AND SUBSIDIARIES COMPUTATION OF PER SHARE EARNINGS Quarter Ended March 31, 1998 1997 (In millions of dollars, except share data) Basic: Net income $ 8 $ 42 Basic weighted average number of common shares outstanding (thousands) 53,373 52,408 Basic per share amount $ .16 $ .80 Diluted: Net income $ 8 $ 44 Weighted average number of common shares outstanding (thousands) 53,373 52,408 Weighted average common equivalent shares (thousands): Deferred awards 352 353 Stock options using the average market price during the period 120 472 Shares from assumed conversion of preferred securities - 4,566 Diluted weighted average number of common shares outstanding and common equivalent shares (thousands) 53,845 57,799 Diluted per share amount $ .16 $ .76