I give weekly riddles in my classroom on Fridays which sparked this idea of giving a review in riddle format for math!
It can be review before a test or just a fun activity to review skills from all year. Many different skills are present in this activity and they are all written as riddles so it's more fun for the kids.
I usually have them do this individually by giving them X amount of time to complete each one. We work through them & grade them at the end, and whoever gets the most riddles correct, wins!