This activity is great for math journal time OR as a station/center activity to review personal references for the U.S. customary system and the metric system.
I designed this activity to review concepts already taught in Everyday Mathematics third grade curriculum in Unit 3, but it could go with any curriculum that focuses on measurement.
You could also do this activity differently than the way I have written on the instructions. You could have the kids play concentration with the words and pictures. In addition, you could just use the words and have the kids draw/write their own personal references next to those words on their journal.