I ran the update for the newest version of Numbers. Now I cannot open some of my spreadsheets. When I try I get a drop down box that says I need a newer version of Numbers!!!! I have just installed the newest Numbers update. Any suggestions?

Welcome to Apple Support Communities

When you upgraded Numbers to the most recent version, the Mac App Store kept the old version in case you need it in the future. Your problem is that you are opening the old version by mistake instead of the new one.

To fix this, open a Finder window, select Applications in the sidebar and drag the new Numbers version (the one with the new icon) to the Dock. By doing this, you can access to the new Numbers version easily, so you will not open the old version by mistake anymore. Also, I recommend you to open the documents after opening Numbers. The same applies for all other iWork applications.

If you want, you can remove the old Numbers version, but some users have complained about the lack of features of the new Numbers version. Apple will add more features in the future. See > http://support.apple.com/kb/HT6049?viewlocale=en_US&locale=en_US

You are welcome