Two version of Numbers
After updating to numbers 3 I have 2 versions of numbers on my iMac. How can I delete the older version?
numbers-OTHER, OS X Mavericks (10.9)
This is normal. The Mac App Store kept the old Numbers version in case you need it in the future.
I recommend you to leave the old version there because users have complained about the lack of features of the new Numbers version, so it's better to keep it in case you need one of the features of the old version. Read > http://support.apple.com/kb/HT6049?viewlocale=en_US&locale=en_US
If you are sure you don't need the old Numbers version, open a Finder window, choose Applications in the sidebar and delete the old Numbers version (or move it to an external drive)