if you want to order it DESC put DESC in your query.
$postslist = new WP_Query('meta_key=Ordermetakey&orderby=meta_value_num&order=DESC&posts_per_page=5');
if you want to order it DESC put DESC in your query.
$postslist = new WP_Query('meta_key=Ordermetakey&orderby=meta_value_num&order=DESC&posts_per_page=5');