try this method.
Go to http://www.openoffice.org/download/other.html
Choose to download Linux x86-64 RPM
Extract the tar file contents using this command: tar -xvzf <your_downloaded_openOffice>.tar.gz
Upon successful extraction of the files cd into the extracted directory. Inside you will see a lot of installation files with rpm extension. Please sudo as root to enable to run the installation files
After sudo as root, type this command to start installation: rpm -Uvih *rpm.
The last step will be after installing the rpms successfully, cd into the desktop integration directory inside the extracted directory and install the desktop rpm. Openoffice should be available now.