If those are text values--not real numbers, you can use:
Begins with 11
or
begins with 15
if they're real numbers, you could use a separate helper column with a formula
like:
=""&a2
(and drag down)
Then filter on this helper column--since it's text.
Or you could insert a helper column and use a formula like:
=or(a2>=1100,a2<1200,a2>=1500,a2<1600)
and filter that column to show Trues
(xl2003 supports up to 2 criteria in the custom filter dialog--I don't recall
what xl2007 supports.)
--
Dave Peterson