When I try to open 'numbers' on my mac air it says the application "numbers" can't be opened - 1712

How can I fix this?

Zulu,
Quit (by any means necessary) Numbers.
Move the Numbers preference file from here:
/Users/<your user name>/Library/Preferences/com.apple.iWork.Numbers.plist
replace <your user name> with your user name.
to go to the folder select the menu item "Go > Go To Folder..." and enter the path:
"/Users/<your user name>/Library/Preferences/" then locate and move the file:
com.apple.iWork.Numbers.plist
To the Desktop:
Now Launch Numbers

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