Are you looking for a new (and maybe even fun...??) way to assess your students' understanding of the basic operations - addition, subtraction, multiplication, and division? This set of 35 fourth-grade, common-core aligned tasks will push your students to truly show what they know as they try to find the error.Error analysis problems are a great way to check your students' understanding of a concept. Instead of just solving the same problems again and again on a worksheet, they have to use thei