Treasure hunt - students have a handout full of algebra questions they have to answer and to find the answers around the classroom/corridor/school and write the corresponding symbol.
Math Lesson Plan: Algebra Simplifying Trail
69 can also mean a sex position of two people. I would change a few symbols
fun might be a little time consuming once having figured the answer then decode the answer and put it together but still very fun for the kids
I think my students will really enjoy this. Thanks.