Math Released Set Algebra 1 PBA Item #13 Two Real Numbers Defined M44105

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1 Math Released Set 2015 Algebra 1 PBA Item #13 Two Real Numbers Defined M44105

2 Prompt

3 Rubric Task is worth a total of 3 points. M44105 Rubric Score Description 3 Student response includes the following 3 elements. Reasoning component = 3 points o Correct identification of a as rational and b as irrational o Correct identification that the product is irrational o Correct reasoning used to determine rational and irrational numbers Sample Student Response: A rational number can be written as a ratio. In other words, a number that can be written as a simple fraction. a = can be written as 4. Thus, a is a 9 rational number. All numbers that are not rational are considered irrational. An irrational number can be written as a decimal, but not as a fraction. b = cannot be written as a fraction, so it is irrational. The product of an irrational number and a nonzero rational number is always irrational, so the product of a and b is irrational. You can also see it is irrational with my calculations: 4 ( ) 9 = is irrational. 2 Student response includes 2 of the 3 elements. 1 Student response includes 1 of the 3 elements. 0 Student response is incorrect or irrelevant.

4 Anchor Set A1 A8

5 A1 Score Point 3

6 Annotations Anchor Paper 1 Score Point 3 This response receives full credit. The student includes each of the three required elements: Correct identification of a as rational and b as irrational (The number represented by a is rational... The number represented by b would be irrational). Correct identification that the product is irrational (The product of the expression ab would equal an irrational number). Correct reasoning to determine rational and irrational numbers (rational because it repeats, and can be written as a fraction), (irrational... it cannot be written as a fraction), (a nonzero rational number multiplied by an irrational number can never be rational, only irrational... cannot be written as a fraction). Note: Since a is defined as a = we know that the product will not be zero, so we know the student s explanation is sufficient.

7 A2 Score Point 3

8 Annotations Anchor Paper 2 Score Point 3 This response receives full credit. The student includes each of the three required elements: Correct identification of a as rational and b as irrational (a is rational... b is irrational). Correct identification that the product is irrational (the product of a and b is irrational). Correct reasoning to determine rational and irrational numbers (rational because it is repeated... irrational because the digits have no specific pattern).

9 A3 Score Point 2

10 Annotations Anchor Paper 3 Score Point 2 This response receives partial credit. The student includes two of the three required elements: Correct identification of a as rational and b as irrational (a = rational), (b = irrational). Correct identification that the product is irrational (The product of a and b would have to be irrational). The student does not provide reasoning to determine rational and irrational numbers.

11 A4 Score Point 2

12 Annotations Anchor Paper 4 Score Point 2 This response receives partial credit. The student includes two of the three required elements: Correct identification of a as rational and b as irrational (a is rational... b is not rational). Correct reasoning to determine rational and irrational numbers (rational because it can be expressed as a fraction ( 4 )... not rational because it can t be expressed as a 9 fraction). The student does not indicate that the product of the two numbers would be irrational.

13 A5 Score Point 1

14 Annotations Anchor Paper 5 Score Point 1 This response receives partial credit. The student includes one of the three required elements: Correct identification of a as rational and b as irrational (a. is rational... b. is irrational). The response does not receive credit for correct reasoning to determine rational and irrational numbers because the explanation of the irrational number is incorrect (it will stop). The student does not identify the product as an irrational number.

15 A6 Score Point 1

16 Annotations Anchor Paper 6 Score Point 1 This response receives partial credit. The student includes one of the three required elements: Correct reasoning to determine rational and irrational numbers (rational... are able to be put into a fraction). It is only necessary for the student to provide correct reasoning for determination of either rational or irrational numbers to receive credit for this element. The reasoning for both types of numbers is not required. The student does not identify a as rational or b as irrational. In addition, the product of a and b is not identified as irrational. The response does show some understanding of the characteristics of rational numbers

17 A7 Score Point 0

18

19 Annotations Anchor Paper 7 Score Point 0 This response receives no credit. The student includes none of the three required elements: The student reverses the identification of a and b (the product of a is irrational... product b is rational). The student does not indicate that the product of the two numbers would be irrational. The reasoning used for determining whether a number is rational or irrational is incorrect. Both rational numbers and irrational numbers can be (continued).

20 A8 Score Point 0

21 Annotations Anchor Paper 8 Score Point 0 This response receives no credit. This response does not satisfy any of the three required elements. It is not true that both numbers are irrational; therefore, this statement demonstrates a lack of understanding of differentiating between rational and irrational numbers. There is no attempt to provide the last two elements of the prompt.

22 Practice Set P101 - P105

23 P101

24 P102

25 P103

26 P104

27 P105

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29 Practice Set Paper Score P101 3 P102 2 P103 2 P104 1 P105 3

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