I wanted to share a simple activity I use with my 4th graders during our capacity unit. We use math journals in our class and before/during/after the concept unit we add something to the journal. When we add to the journal depends on what we have time for fits the bill... I use these as a visual reminder of what each unit is. They are made to be like windows. They cut out on the solid lines of the words and put glue only above the dotted line and paste the corresponding picture underneath the word flap. It works nicely as a reminder in case they ever forget.