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Students love it when their teacher brings a new type of activity into the classroom. Error Analysis is a great way to bring in a challenge to your students, and to get them talking about math. In this zip file are 6 one-step equations solved incorrectly. Once they are printed and hung around the classroom, students use the prescription pad to diagnosis the problem and provide treatment with the correct solution. These one-step equations include a mix of integers, fractions, and decimals. Answer keys are included. :)