In Numbers, how can I get the spreadsheet to remain stationary on the page? I have tried to double tap thinking that would display and anchor the sheet but it doesn't work.
IOS – Numbers floating sheets
iosnumbers
Related Solutions
This screen shot is from Keynote for iPad, but Numbers for iPad is pretty much the same:
When you view the file in Preview mode, the title bar of the document should look pretty similar to the above. Over there on the right is the Open in… button.
There might be a 
button that you have to click first before you see the Open in… button.
Other ways to transfer files to your iPad:
I had the same problem. A hard reset of my iPad (press and hold both the home button and the power button until the device turns off, then wait while it reboots) solved the issue.
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Best Answer
In your question, you mention:
So is it safe to say you are referring to Numbers on iOS? If so, to lock a table or element do the following:
To edit again or move, unlock in the same manner.
Hope this helps!