Facebook page is a unique way of posting and sharing our thought or sharing our post to the world and getting views, comments or website visitors.
If you are a page owner or an admin of different page and the entire page you own talks about the same thing all they represent the same topic you can merge them.
Merging one page to another means that all your likes and check in will be in one page that is the page you are merging to. But all your post and the username will be deleted from the page that you merge.

The page that you are about to merge must have the same topic or interest to the one that you are merging to or else the page cannot be merged.
An example of a page that can be merged:
Techskulz can be merged in Tech Skulz.
Here are the steps on how to merge the pages together.
Step 1: Log in to your Facebook account using your profile not as your page profile
Step 2: Go to the page you want to keep and click settings at the top of the page
Step 3: Under settings click general and click the edit link next to merge pages.
Step 4: Click on request to merge duplicate pages
Step 5: Fill the form and click on send.
If you have successfully merged the page a message will come up like "Thank you for contacting Facebook, you should receive an email response shortly...."
After that wait till you get a message back from Facebook.
If you could not find "Page Merge" option on your page settings that means that your page cannot be merged at this time. Or you can you can submit a request to Facebook at https://www.facebook.com/help/contact/?id=238908726149664.

There you can select the page you want to keep and also the page you want to merge. You can select up to 5 pages and merge it into your destination page.
And you are done.

PS: You can only merge pages that you manage and do not submit a duplicate page because you might wait for up to 14 days.
See more at http://www.techskulz.com/2014/11/how-to-merge-more-than-two-facebook.html

the method you outlined no longer works. See the new technique http://oscaranswers.com/join-facebook-page/