3 Student is unable to Student makes an error Student answers Part Student correctly: answer either part of in calculating either (a) correctly, and Finds 14 sq cm as the question correctly. area or perimeter in identifies that John is the area of each 3.MD.8 Part (a) that makes the incorrect in Part (b), shape, and perimeters of 20 cm example unhelpful for but the explanation and 18 cm. explanation in Part (b). may specifically Identifies that John mention area or OR is not correct. perimeter. Student may or may Explanation includes not calculate Part (a) the argument that correctly. In Part (b), area is based on the explanation is total square units unspecific and may and stays constant simply state that Part as long as the total (a) proves John is stays the same, but when square units wrong. are rearranged more sides may be exposed, which can change the perimeter. Student correctly: 4 Student is unable to Student: Student completes all answer any part of the parts of the question Finds all the Attempts to find question completely correctly, but may possible perimeters perimeters, but 3.MD.4 as 24 cm, 26 cm, 30 correctly. provide an unclear makes errors in cm, 40 cm, and 74 explanation in Part (a). 3.MD.8 calculation. cm. Explanation is Provides an unclear appropriate to the or no explanation. problem (e.g., Completed line plot includes finding the factors of 36 and correctly based on then drawing the chart. rectangles with corresponding perimeters and referencing with the chart). Correctly plots the number of students on the line plot. 5 Student correctly: Student is unable to Student answers at Student answers at answer any question least one question least two questions Answers 4 cm. correctly. correctly. correctly. Explanation includes 3.G.1 that a square has four equal sides. 3.MD.8 Draws a figure with a perimeter of 32
3 3.MD.8 Student is unable to answer either part of the question correctly. Student makes an error in calculating either area or perimeter in Part (a) that makes the example unhelpful for explanation in Part (b). OR Student may or may not calculate Part (a) correctly. In Part (b), the explanation is unspecific and may simply state that Part (a) proves John is wrong. Student answers Part (a) correctly, and identifies that John is incorrect in Part (b), but the explanation may specifically mention area or perimeter. Student correctly: Finds 14 sq cm as the area of each shape, and perimeters of 20 cm and 18 cm. Identifies that John is not correct. Explanation includes the argument that area is based on total square units and stays constant as long as the total stays the same, but when square units are rearranged more sides may be exposed, which can change the perimeter. 4 3.MD.4 3.MD.8 Student is unable to answer any part of the question completely correctly. Student: Attempts to find perimeters, but makes errors in calculation. Provides an unclear or no explanation. Completed line plot correctly based on the chart. Student completes all parts of the question correctly, but may provide an unclear explanation in Part (a). Student correctly: Finds all the possible perimeters as 24 cm, 26 cm, 30 cm, 40 cm, and 74 cm. Explanation is appropriate to the problem (e.g., includes finding the factors of 36 and then drawing rectangles with corresponding perimeters and referencing with the chart). Correctly plots the number of students on the line plot. 5 3.G.1 3.MD.8 Student is unable to answer any question correctly. Student answers at least one question correctly. Student answers at least two questions correctly. Student correctly: Answers 4 cm. Explanation includes that a square has four equal sides. Draws a figure with a perimeter of 32