We incorporate ten frames a lot to build number concepts. This month we are focusing on the concept of 1 more and 1 less. We've found a great manipulative to use when covering ten frames, and it comes from the dollar store. Many times you can find they have ice cube trays that go along with the season/theme. They have just ten openings, which is perfect. We either use pompoms to fill them or themed mini erasers. Changing them out monthly, helps keep the stations/activities fresh.