Q: Pages & Numbers app Just disappear from my mac.

Hi WuaWua,

Welcome to the Support Communities!

The following articles will explain what's new with the iWork applications and Mavericks:

http://www.apple.com/pr/library/2013/10/23Apple-Introduces-Next-Generation-iWork -and-iLife-Apps-for-OS-X-and-iOS.html

Pricing & Availability

 

iWork and iLife for Mac come free with every new Mac purchase. Existing users running Mavericks can update their apps for free from the Mac App Store℠. iWork and iLife for iOS are available for free from the App Store℠ for any new device running iOS 7, and are also available as free updates for existing users. GarageBand for Mac and iOS are free for all OS X Mavericks and iOS 7 users.

 

If Pages, Numbers, and Keynote are not in your Purchases list, apply for the Up‑To‑Date Program.

 

Apple - Up-to-Date Program for Pages, Numbers, and Keynote

http://www.apple.com/creativity-apps/mac/up-to-date/

 

About the new iWork for Mac: Features and compatibility

http://support.apple.com/kb/HT6049

http://www.apple.com/support/iwork/

 

You can continue to use these features by accessing the previous versions of the iWork applications which remain installed on your Mac. The previous versions can be found in Applications > iWork ’09.

Cheers,

- Judy