After much research and discussion with mathematics educators, it is apparent that secondary education students make many common errors in mathematics. As a result, it is important to analyze what causes and how to address these mathematical errors so that teachers can correct and prevent these errors within the classroom. Therefore, I have briefly researched and analyzed the causes of mathematical errors in secondary education and ways to address students' errors. Then, through research, classroom observations, and discussions with secondary education teachers, I compiled a list of common student errors in mathematics and created activity sheets that address each error individually. To coincide with my research findings, the activity sheets confront each error conceptually and incorporate various mathematical representations.