#1.) Handwriting. And people specifically mentioned that handwritten thank-you notes are quickly disappearing.
#2.) Using a dictionary or encyclopedia. Now we just Google words to find out what they mean . . . or research things on Wikipedia.
#3.) Mental math.
#4.) Reading a map. The GPS and mapping apps have made maps obsolete.
#5.) Finding something at the library. No one remembers how to find a book using the catalog and the Dewey Decimal System anymore.
#6.) Playing board games. Every board game has an iPad version now.
#7.) Sending a postcard. We publish our own vacation photos on Facebook instantly now, so there's no real need to send a postcard.