Here is simple way.
Follow the steps.
Step-1
Tap/Click on “Facebook” App icon from your Android Screen.
Step-2
Now, Tap/Click on Right side “Menu” icon
Step-3
Then, Click on “Settings and Privacy” from Menu
Step-4
Now, Click on “Settings”
Step-5
After then, Click on “Account Ownership and Control”
Step-6
Now, Click on “Deactivated and Deletion”
Step-7
Select “Deactivate Account” and Click on “Continue to Account Deactivation” Button
Step-8
Then, Type: “your password” and Click on “Continue” Button
Step-9
Finally, Select “This Is Temporary. I’ill back” and Click on “Continue”
Done…