# Performance Assessment Task Which Shape? Grade 3. Common Core State Standards Math - Content Standards

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2 Which Shape? This problem gives you the chance to: identify and describe shapes use clues to solve riddles Use shapes A, B, or C to solve the riddles. A B C 1. I have 4 sides. My opposite sides are equal. I have 4 right angles. Which shape am I? 2. I have 4 sides. I have only 1 pair of parallel sides. Which shape am I? 3. I have 4 sides. My opposite sides are parallel. I do not have any right angles. a. Which shape am I? b. Draw lines that divide my shape into a rectangle and two right triangles. Copyright 2007 by Mathematics Assessment 74 Which Shape? Test 3

3 4. Write three different clues for shape D. D Clue 1: Clue 2: Clue 3: 5. Look closely at shapes E and F. E F Write a statement that tells how they are alike. Write a statement that tells how they are different. 9 Copyright 2007 by Mathematics Assessment 75 Which Shape? Test 3

4 Task 4: Which Shape? Rubric The core elements of performance required by this task are: identify and describe shapes use clues to solve riddles Based on these, credit for specific aspects of performance should be assigned as follows points section points 1. Gives correct answer: C or rectangle 1 2. Gives correct answer: B or trapezoid 1 3. Gives correct answer: A or parallelogram Draws lines that are correct. 4. Gives three correct statements such as: I have 4 sides. I have 4 right angles. All my sides are equal. 5. Gives two correct statements such as: They both have 4 sides. Shape F has a line of symmetry, and E does not. Shape F has four equal sides, and shape E does not ft 2 3x1 2x1 2 Total Points 9 3 Copyright 2007 by Noyce Foundation 76

5 Which Shape? Work the task. What are some of the attributes that you might expect students to use to describe the shapes in parts 4 and 5? What are some of the attributes or vocabulary that you think will give them difficulty? Mathematical literacy requires attention to details and constraints that is different from the level of detail needed to make sense of a story. Look at the first part of the task, identifying shapes from clues. In part one, approximately 11% of the students saw the 4 sides and picked shape A. How many of your students made this choice? In part two, students saw the parallel sides, but ignored the one pair. 23% picked shape A and 11% picked shape C. How did your students do? 30% of the students saw the no right angles, the last clue read, and picked shape B for part 3. 30% of the students did not attempt to draw lines for part 3b. What types of errors do you see in the student drawings? Which attributes confused students? (It might be helpful to draw a few examples, so that you can categorize mistakes or think how to set up a discussion about the errors with the class.) Look at the clues students used for part 4. List them into categories of correct or incorrect, incomplete. Students often think of mathematical ideas not anticipated by the rubric, so add those to the list as you find them. Correct Attributes Incorrect Attributes 4sides Equal sides 4 angles Right angles Parallel sides Line of symmetry Copyright 2007 by Noyce Foundation 77

7 Looking at Student Work on Which Shape? Student A is able to use the clues to identify the shapes being described and names the shapes. The student draws lines on shape A to meet the constraints or demands of the task. The student uses geometrical vocabulary to describe the attributes in parts 4 and 5. Student A Copyright 2007 by Noyce Foundation 79

8 Student A, part 2 Copyright 2007 by Noyce Foundation 80

9 Recognizing the Seeds of Mathematical Ideas Students sometimes come up with mathematical ideas not anticipated by the rubric or using imprecise language. How do we, as teachers, develop the flexibility to see mathematical thinking in student work? Look at the work of Student B. Notice that one scorer has given the student credit and one has not. Has the student noticed important characteristics about the shapes? Student B Look at the work of Student C. When taken alone, 2 right angles is not enough to describe shape D; neither is 4 sides or 4 equal sides. Clues need to be considered as a set. Can you make a shape with 4 sides and 2 right angles that is not a square? Can you make a shape with 4 equal sides and 2 right angles that is not a square? Student C Copyright 2007 by Noyce Foundation 81

10 Student D has the seeds for the mathematical idea of rotational symmetry, but doesn t have the mathematical language to name the property. How do we encourage students to think about important ideas, which might not be introduced formally until much later grades? How do we keep them looking for and discovering relationships? Student D What s wrong with this picture? Students had difficulty drawing in the lines to make a rectangle and two right triangles. For each piece of student work, try to identify the attributes that they overlooked or incomplete definitions about a shape. Student E makes two triangles and a four-sided shape. What is the student not understanding or focusing on? Now look at part 4. The student comes up with for mathematical ideas about the square, but then uses none of those ideas in thinking about shapes E and F. What might be a next instructional move for this child? Student E Copyright 2007 by Noyce Foundation 82

11 Shape E, part 3 Copyright 2007 by Noyce Foundation 83

12 Student F has trouble with the drawing in part 3. What is the student forgetting? Examine the student s description of differences. The student is probably noticing the reflex angle in E, but does not know how to talk about it and leaves the description vague. We sometimes want students to have precise language. When encountering a new idea, students need to rely on everyday language and some mathematical language used in new ways. What are some ways that we might hope third graders would describe this angle? What are the attributes from part 4 that might help the student in thinking about the differences between the two shapes? What could the student build on? Student F Copyright 2007 by Noyce Foundation 84

13 What are each of these students understanding and not understanding? Student G Student H Copyright 2007 by Noyce Foundation 85

14 Do you think Student I is only asked to draw lines when looking for symmetry? Student I What are the important attributes of shape that we want students to pay attention to? How do we help them develop their sense of what to pay attention to? Look at the work of Student J. Does the student only think about angles as acute shapes? Notice that the student in part 5 is thinking about the shape as a totality, rather than comparing parts. How is this student thinking about the reflex angle? Student J Copyright 2007 by Noyce Foundation 86

15 Thinking about the angle in E is difficult for students. While we don t want students to memorize formal language about the angle, students should have opportunities to encounter and think about these types of big mathematical ideas and try to describe them. What questions might you want to ask Student K to probe his thinking? Copyright 2007 by Noyce Foundation 87

16 Student K Look at the descriptions by Student L. Would you have given them credit? Why are why not? Are the attributes accurate? Relevant? Student L Copyright 2007 by Noyce Foundation 88

17 Some students struggled with just counting the sides and angles for the two shapes. See some typical responses by Students M and N. Student M Student N Copyright 2007 by Noyce Foundation 89

18 Finally some students, like Student O, are still operating at the lowest van Hiele level. They are thinking of what the shape looks like and how it can be subdivided. Student O Copyright 2007 by Noyce Foundation 90

19 3 rd Grade Task 4 Which Shape? Student Task Core Idea 4 Geometry and Measurement Identify and describe shapes, using key attributes. Use clues to solve riddles. Identify how shapes are alike and different using geometric attributes. Recognize and use characteristics, properties, and relationships of two-dimensional geometric shapes. Identify and compare attributes of two-dimensional shapes and develop vocabulary to describe the attributes. Use visualization, spatial reasoning, and geometric modeling to solve problems. Recognize geometric ideas and relationships and apply them to problems. Mathematics in this task: Understanding geometric attributes, such as angle size, number of angles, number of sides, parallel sides. Sorting and describing shapes using attributes. Comparing and contrasting shapes on geometric attributes. Composing and decomposing shapes. Based on teacher observations, this is what third graders know and are able to do: Identify shapes by their attributes Describe attributes of a square, particularly 4 sides and 4 angles Areas of difficulty for third graders: Drawing in lines to decompose a shape into a rectangle and two triangles Describing similarities and differences for E and F Correct vocabulary o Students used point or corner for angle o Closed shape, open shape o How to classify angles o They confused side and face and side and edge o Parallel sides Copyright 2007 by Noyce Foundation 91

20 The maximum score available on this task is 9 points. The minimum score needed for a level 3 response, meeting standards, is 4 points. Most students, 88%, could give 3 clues for describing a rectangle. 77% could also identify the shape with 4 right angles and opposite sides equal. Almost half the students, 47%, could identify all 3 shapes and give 3 clues for describing a rectangle. 30% could also draw in lines for subdividing a shape into a rectangle and two right triangles. 5% could meet all the demands of the task including comparing and contrasting shapes E and F, using geometric attributes. About 2% of the students scored no points on the task. Half of these students attempted the task. Copyright 2007 by Noyce Foundation 92

21 Which Shape? Points Understandings Misunderstandings 0 Half the students with this score attempted the task. They had difficulty describing attributes for a square. They gave information, such as: no angles or no right angle, looks like a box or piece of paper or a rectangle, or 3 Students could give 3 clues about a square. 4 Students could identify the rectangle from clues and give 3 clues for a square. 6 Students could identify rectangle, parallelogram, and trapezoid from their attributes and give attributes for a square. 7 Students could identify shapes from attributes and describe attributes of shapes. Students could decompose a shape into rectangle and two right triangles. its pointy. They had difficulty matching a set of clues to a shape. For part 1 (4 sides, 4 right angles) 11% of the students picked the parallelogram. For part 2 (4 sides, only 1 pair of parallel sides) 23% picked the parallelogram and 11% picked the rectangle. For part 3 (4 sides, no right Angles, opposite sides parallel) 30% picked the trapezoid. 30% of all students did not draw lines to subdivide a shape into a rectangle and 2 right angles. Students did not usually think carefully about angle size. Students had difficulty describing the similarities and differences between two shapes. 31% described the shapes as sharp or pointy.16% just noted that the shapes were different. 16% thought that E had only 3 angles or 3 sides. 7% tried to describe the concave angle with words like indent or goes in and goes out. 9 Students could identify shapes from attributes and describe attributes of a square. They could decompose shapes into component parts by attributes. They could also compare and contrast shapes based on geometric attributes. Implications for Instruction Students should be able to think about the geometric attributes of shapes: number of sides, number of angles, types of angles, length of sides, and parallel sides. Students should be able to both identify a shape from its attributes and describe the attributes of a shape. Copyright 2007 by Noyce Foundation 93

22 Students need experiences with a rich variety of 2- and 3- dimensional shapes. Students should be pressed to describe how shapes are the same or different. This helps them become of aware of a variety of attributes and lays the foundation for understanding formal definitions at a later time. Ideas for Action Research The Logic of Classifying and Sorting Look at the lesson below (from Teaching Student-Centered Mathematics, Grades K-3 by John Van de Walle). How might this lesson be modified to help students think about 3- dimensional shapes? Can you design your own set of shapes? Make sure you think carefully about the question posed by the Stop Sign. Copyright 2007 by Noyce Foundation 94

23 Copyright 2007 by Noyce Foundation 95

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