This pack teaches students to find and fix mistakes in multi-digit multiplication and long division. You get clear directions, worked examples with realistic student errors, spaces for students to explain thinking, and an answer key. Use it for warm-ups, small-group intervention, independent practice, or exit tickets. The printable design saves you grading time and sparks classroom discussion. Grade level: 5th. Keywords: error analysis, multi-digit multiplication, long division, critical thinkin