Grouping cards. They can be used as independent review activity or as move around between tasks activities. Involve cooperative learning, and review of concepts.
Depending on type of activity you choose to do can take anywhere from 5 minutes (simply group once by 1 factor) to 40 minutes (group 4 times mathematically, and once by color for a break + perform a task with terms like combining all like terms in the group, add/subtract/multiply/divide all numbers of your type).
So many pages, because cards are sized to match 3x5 cards, and offered colored and black and white.
I appreciate feedback, and corrections if you caught something I missed.