$query = new WP_Query( array ( 'orderby' => 'meta_value', 'meta_key' => 'nr_like' ) );

'orderby' => 'meta_value_num'

if ( $query->have_posts() ) : while ( $query->have_posts() ) : $query->the_post();

      // this is your loop

 endwhile;

 else:

      //no posts were found

 endif;

 //end of loop