Correcting mistakes 0 Overview Using this Resource Connecting to the Curriculum Marking Student Responses Further Resources This task is about correcting measurement mistakes. Three students gave incorrect answers to questions about area and perimeter. Write down the mistake that each student made. Question 1Change answer Sophie said, "The perimeter of the book is 30 cm." What was Sophie's mistake? Sophie said, "The perimeter of the book is 30 cm." What was Sophie's mistake? Question 1Change answer Mike said, "The perimeter of the table top is 6 m." What was Mike's mistake? Mike said, "The perimeter of the table top is 6 m." What was Mike's mistake? Question 1Change answer Each square of this pattern is 1 cm2. Tom said, "The area of the pattern is 20 cm2." What was Tom's mistake? Each square of this pattern is 1 cm2. Tom said, "The area of the pattern is 20 cm2." What was Tom's mistake? Task administration: This task can be completed with pencil and paper or online. Levels: 3, 4 Curriculum info: Maths, Geometry and Measurement, Measurement Key Competencies: Thinking Keywords: measurement, perimeter, area, problem solving Description of task: Students identify the error in three statements made about the perimeter and area of given objects. Curriculum Links: This resource can help to identify students' understanding of area and perimeter. Learning Progression FrameworksThis resource can provide evidence of learning associated with Measurement sense, set 5Measurement sense, sets 6-7 within the Mathematics Learning Progressions Frameworks.Read more about the Learning Progressions Frameworks. Answers/responses: Y6 (09/2000) a) Any 1 of: She only worked out half of the perimeter. She added 10 + 20 (instead of adding 20 + 10 + 20 + 10). She added two side lengths (instead of adding the four side lengths). Other sensible explanations. moderate b) He worked out the area (instead of the perimeter). He multiplied 3 × 2 (instead of adding 2 + 3 + 2 + 3). He counted the squares (instead of adding the side lengths). Other sensible explanations. moderate c) He worked out the perimeter (instead of the area). He added 5 + 10 + 5 + 10 (instead of multiplying 5 × 10). He added the side lengths (instead of multiplying them or counting the squares). Other sensible explanations. difficult Finding area and perimeter Measuring the extension How big is the community hall? Making road signs Changing perimeter Area and perimeter Area of 3 fields Same area, different lengths Setting up tables Smallest perimeter Making the largest perimeter Area and perimeter of four shapes
