These cards were made to be used to help students learn to use problem solving skills in the form of error analysis. As we know, common errors in math are made frequently. These cards help students recognize common mathematical mistakes. Simply write the problem and show the work using the mistake you want the students to look out for. The nature of the card already indicates the problem is incorrect so when the students are given the card they know it is their job to locate the mistake and offer next steps. This can be used in whole group, as a center, or in small group practice.