Students match the 1920s slang word to its modern equivalent. This is how I introduce my 1920s unit but you could close your unit with this too. The students group themselves up and they get a handout with two columns to match up. One column has 35 words/phrases that were commonly used (slang) in the 1920s and the other has the explanation. Two examples are: jalopy--old car, or moll--gangster's girlfriend. The kids always end up making a competition out of it. The group that gets the most right gets 5 extra points on their next assignment, the group that comes in second gets 4, the group that comes in 3rd gets 3 extra points, and everyone else (IF they put forth a good natured effort) gets 1 extra point. The answer key is on the last page.
You might be interested in my other items related to the 1920s:
1920s Pamphlet Activity
Roaring 20s Power Point
Roaring 20s Test
Palmer Raids Primary Source Analysis and Writing Activity
1920s Collage Project
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Roaring 20s Bundle