A modeling resource for teachers to demonstrate the error analysis process. It features a sample rounding error task card and the corresponding completed service log entry to guide students on expectations.

A warm-up activity where students trace the perimeter of rectangles and discover the property of equal opposite sides.

A teacher's answer key providing the error explanation and correct solution for each of the 10 math job tickets in the Fix It Shop center.

A 3-page recording sheet for students to document their error analysis. For each of the 10 "Job Cases," students explain the error, draw a correct visual model, and provide the final corrected solution. Each case includes a summary of the problem to be solved.

A set of 10 math task cards for 3rd grade error analysis, featuring addition, subtraction, multiplication, division, fractions, and area. Each card presents a "broken" problem with a technician's incorrect explanation for students to identify and fix.

Answer key and grading criteria for the Blueprint Builders worksheet and exit ticket.

An exit ticket for assessing perimeter calculation and tool selection, with two tickets per page for easy printing.

A teacher-facing lesson plan and facilitation guide for the Blueprint Builders perimeter lesson.