how do I copy a number from Numbers and past into Pages with AppleScript

I have tried numerous ways and get this error message


Can’t make «class NMCv» of selection of application "Numbers" into type string.

when I

set the clipboard to the value of the selection as string


I have also tried using:

tell application "System Events" to keystroke "c" using {command down}

with and without the brackets


In each case nothing is put into the clipboard. these seemed to have worked for others as I find them as answers to questions similar to this but they don't work for me.