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.