hi. I assume you already did number your pages in the order you want them ? probably you use the pages-widget to display them ? then you just have to tell that widget that you want them ordered by number not by alphabet.
dashboard left side : *click* appearance–> widgets
than dashboard right side : *click* pages—> edit —> sort by numbers —> confirm (or s.th., don’t have the english dashboard)
refresh, look and tell, if that did it or not… : )