Error analysis is a powerful way to engage students in deep thinking about math content. This goes beyond just being able to solve a problem - students need to evaluate, critique, and correct others' work. Error analysis is a great task to use with students who have mastered the skill, but still need reinforcement. In addition, these tasks are in convenient and fun task-card format. I use actual student misconceptions in my math class to design these tasks authentically. In my classroom, I use e