- 37 - Exhibit (11) OWENS CORNING AND SUBSIDIARIES COMPUTATION OF PER SHARE EARNINGS Quarter Six Months Ended Ended June 30, June 30, 1998 1997 1998 1997 (In millions of dollars, except share data) Basic: Net income $ 59 $ 63 $ 67 $ 105 Basic weighted average number of common shares outstanding (thousands) 53,562 52,945 53,464 52,642 Basic per share amount $ 1.09 $ 1.19 $ 1.25 $ 1.99 Diluted: Net income $ 61 $ 65 $ 71 $ 109 Weighted average number of common shares outstanding (thousands) 53,563 52,945 53,465 52,642 Weighted average common equivalent shares (thousands): Deferred awards 16 14 16 14 Stock options using the average market price during the period 746 689 605 757 Shares from assumed conversion of preferred securities 4,566 4,566 4,566 4,566 Diluted weighted average number of common shares outstanding and common equivalent shares (thousands) 58,891 58,214 58,652 57,979 Diluted per share amount $ 1.02 $ 1.11 $ 1.20 $ 1.88