You are getting two activities for the price of one! In this card sort activity are 10 problems. On one side of the cards are polynomials that need to be factored. On the other side of the cards are binomials that need to be multiplied together. You determine which activity you want your students to complete! In this question stack activity, students lay all the cards out with the answers facing up. They turn over any card, work the problem out, then find the answer on a different card. They flip the answer over and stack it on top of the previous problem, and work the new problem out. Because the answers are already in front of them, this is self checking, and students should end where they began. You are basically tricking them into doing a worksheet! There is also a recording sheet and an answer key. This activity corresponds to Texas Algebra 1 TEKs: -A.10B: multiply polynomials of degree one and degree two (supporting)-A.10E: factor trinomials (readiness) This can be completed individually or in pairs, as a test review, homework assignment, classwork activity, left side practice in an interactive notebook, or station. My students love these activities because they can check themselves as they go, and work at their own pace.