How do I delete multiple PDFs on my iMac?

Click the first and then command-click the next and the next, then Delete.

OR

Click the Desktop next to the first, then drag across the first pdf and across or down to the next ones, then Delete.

Select items on your Mac screen - Apple Support

Or, click on the finder face in the dock, navigate to the desktop, fiddle a bit until you get alphabetic list, then click the first and shift-click the last file. Right/control click and select delete.

Just to be sure are you trying to:

• Delete all PDFs everywhere on your Mac?
• Delete all PDFs in your Home Directory?
• Delete all PDFs in a specific folder?
• Something else?