I just happened upon an activity the other day. My class and I were discussing how much each BoxTop for Education is worth (10 cents). As a group, we got out our bag of BoxTops that had been brought in and started counting. About half way into counting it dawned on my that we were doing a 10s activity AND a money activity. So, if you have a big bag of BoxTops, divide them up by tables and have each group count each BoxTop by 10s. Then you can have each table tell you the monetary value of their Boxtops counting by 10s.
This is a fun and easy activity and as a bonus, it keeps the BoxTops a topic of interest for the students. This might help them remember to bring in the valuable little items. Have fun!