Like this?
DROP TABLE IF EXISTS #t1;
CREATE TABLE #t1
(
c1 INT
);
INSERT #t1
(
c1
)
VALUES
(2 )
,(11)
,(4)
,(9);
SELECT t.c1
,c2 = t.c1 / 2
,c3 = t.c1 - t.c1 / 2
FROM #t1 t;
If you haven't even tried to resolve your issue, please don't expect the hard-working volunteers here to waste their time providing links to answers which you could easily have found yourself.