get_terms orderby name as numbers

I know this post is very old but still answering for others who reach here.

Following is a very simple filter to sort the terms as numbers. You only need to set the variable $taxonomy_to_sort with taxonomy slug and place it in functions.php of your theme.

add_filter( 'get_terms_orderby', 'terms_order_as_number', 10,  3);

function terms_order_as_number($order_by, $args, $taxonomies){

    $taxonomy_to_sort = "numbers";

    if(in_array($taxonomy_to_sort, $taxonomies)){
        $order_by .=  " * 1";
    }

    return $order_by;
}