my pages and numbers are gone

Where is your Time Machine backups prior to that reinstallation of OS X. If you wiped the hard drive as part of the new installation, no unbundled OS X applications will be installed. If you didn't wipe the hard drive, and simply did an update, then the applications should still be there.

If you had iWork '09 applications installed, they would have been moved to /Applications/iWork '09 as part of a Pages v5 installation.

The current version of Pages, Numbers, and Keynote that are available in the OS X App Store cannot be installed on Mavericks because they require Yosemite. Your only hope for using compatible versions of these applications on Mavericks is via a restore from a backup. If you cannot do that, you have Pages documents that no other application in the universe can open — save possibly Preview for viewing.

If you lost iWork '09 applications, then reinstall from DVD, and then apply the Apple iWork 9.3 updater. If you do not have the iWork '09 DVD, one can be purchased from Amazon for about $21USD.

If you wipe the hard drive as part of the Recovery HD reinstallation of OS X, then everything will be removed that was previously installed. That is why we always recommend that users regularly backup via Time Machine, or another reliable backup method. Had you done so, you could have restored Pages and Numbers.