It is really an easy way for them to see the relationships. On each pop top, write a digit 0-9. Place pop tops in storage container. To use as a whole class activity, I have the students draw the lines and label the place values on a sheet of notebook paper. Walk around the room and have each student pick out a pop top from the container.
Students are to place it on one of the place values.
Once it is placed, it cannot be moved. Continue this procedure until all place values are filled. Also, for extra practice, have a student write the given numbers on the board. This allows students to not only say the word orally but to also write orally-spoken numbers as well. The object of this game is to be the first player to reach 100.