I would suggest making your own page template.
Start by moving the files into your WordPress theme folder, and giving them a name. Like page-foo.php, page-bar.php, so on.
Then on the top of these new files add PHP like the below, changing the Template Name to something that makes sense to you.
<?php
/*
Template Name: Foo
*/
?>
Then place your code under this header.
Go into WordPress wp-admin, go to Pages and add a new page. Then on the right under the Page Attributes widget, select the Template name that corresponds with your content that you want to display for that page.