Case Files Lesson Plan
An advanced lesson plan for three-digit addition and subtraction (within 1,000). Features a 'Cold Case' detective theme, advanced CUBES strategies, and focus on regrouping across zeros and ignoring distractors.
Mystery Solver Worksheet Corrigendum
An advanced detective-themed worksheet featuring two-digit addition and subtraction word problems with distractors ('Red Herrings') and two-step logic. Includes evidence rooms for showing complex mathematical thinking.
Mystery Solver Answer Key
The answer key for the Mystery Solver Worksheet, providing step-by-step solutions for both single-step and two-step problems with scoring notes.
Cold Case Solver Worksheet
An elite-level detective worksheet focused on 3-digit addition and subtraction (up to 1,000). Includes complex two-step problems, regrouping across zeros, and subtle 'Red Herring' distractors to challenge advanced students.
Cold Case Answer Key
The comprehensive master key for the 'Cold Case Solver' worksheet. Features detailed step-by-step logic for 3-digit problems, identification of 'Red Herrings', and a point-based grading rubric for Lead Investigators.