My students have come to love working towards being “guilty” (of learning) and it has changed the way we operate in my classroom on a daily basis. Instead of the answer being the most important part of our discussions, I have found that pushing them to prove it really deepens their understanding and in turn this proof of understanding becomes to center of our conversations. I have always felt like having my students explain their thinking was incredibly difficult until I realized I needed to make it interesting and engaging to motivate them to WANT to prove it. This made my job really easy. With this resource (as our starting point) I have been able to get all of my students working toward the same goal; not identifying the correct answer but instead proving to me that they know what they are talking about when they do finally come up with an answer to one of the math problems. This resource provides the students with over 150 math questions (aligned to the first grade common core) that they can solve and then explain in their “Case File” spiral notebook. When they finish a card (or two) they simply turn in their case file notebook and if I feel they understand the concept their earn the coveted “guilty stamp” on their “case file manager.” (I purchased my stamp from rubberstamps.net. I created my own .48 inch x 1.55 inch stamp using the Bookman font in size 24 with red ink. It fits the case file manager perfectly!) They love opening their notebooks to see the BIG red word “GUILTY” on their papers. Once they have received their stamp they are free to continue on to another card. The students continue to earn stamps for each explanation they give that is correct and complete. Once they have finished one section completely (operations and algebraic thinking, numbers and operations in base ten, meaurement and data, or geometry) the students picture (mugshot) goes onto our wall in the hallway under the title “Guilty of Learning.” I allow my students to work through these challenges however they want. They can complete all of one section or mix it up. (They just have to make sure they are recording the correct number (from the card) for each question they answer so that I can stamp the correct spot in the “case file manager.”) I hope this resource finds a home in your classroom and allows you to challenge those “early finishers” while encouraging everyone in your classroom to “prove it!” Good luck!