Smarter Balanced Grade 8 Mathematics Answer Key

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GRADE 8 MATHEMATICS Smarter Balanced Assessment Questions

Question Number 1 For each number, indicate whether it is rational or irrational.

Answer Key Question 1 Item Claim Domai n Target DOK CONTEN T MP #2

Answer Key Question 1 Item Claim Domai n Target DOK CONTEN T MP #2 1 NS A 1 8. NS. A. 1 N/A Exemplar: (shown at right) Rubric: (1 point) Student correctly classifies each number as rational or irrational (R, I, R). Key See exemplar

Question Number 2

Answer Key Question 2 Item Claim Domain Target DOK CONTEN T MP Key #3

Answer Key Question 2 Item Claim Domain Target DOK CONTEN T MP Key #3 1 EE B 1 8. EE. A. 2 N/A 18 Key: 18 Rubric: (1 point) Student enters the correct side length.

Question Number 3 The school is 100 meters from Jason's house. The following describes

Question Number 3 The school is 100 meters from Jason's house. The following describes his most recent trip: • He walked 50 meters toward school in 2 minutes. He realized he left a book at home. • He turned around and walked home at the same speed. • He spent 1 minute looking for his book. • He walked all the way to school at twice his original speed. Draw a line that accurately represents Jason's trip.

Answer Key Question 3 Item Claim Domai n Target DOK CONTEN T MP Key

Answer Key Question 3 Item Claim Domai n Target DOK CONTEN T MP Key #5 1 F F 2 8. F. B. 5 N/A See exemplar Exemplar: (Shown at right) Rubric: (1 point) Student correctly graphs all three line segments.

Question Number 4 Write each number on its correct position along the number line.

Answer Key Question 4 Item Claim #1 1 Domai n NS Targe DOK t

Answer Key Question 4 Item Claim #1 1 Domai n NS Targe DOK t A 2 Exemplar: (shown at right) Rubric: (2 points) student places all three values at the correct positions on the number line (1 point) student places two of the three values at CONTEN T 8. NS. A. 2 MP Key 6 See exemplar

Question Number 5 Draw the image of the figure after the following transformation: •

Question Number 5 Draw the image of the figure after the following transformation: • A reflection over the x-axis • A horizontal translation 7 units to the left

Answer Key Question 5 Item #6 Claim Domai n 1 G Target DOK G

Answer Key Question 5 Item #6 Claim Domai n 1 G Target DOK G 2 Exemplar: (shown at right) Rubric: (2 points) Student correctly reflects and translates all points. (1 point) Figure is reflected over the x-axis correctly; no translation. OR figure is translated but not rotated CONTE NT 8. G. A. 3 MP Key N/A See exemplar

Question Number 6 A 13 -foot ladder is learning on a tree. The bottom

Question Number 6 A 13 -foot ladder is learning on a tree. The bottom of the ladder is on the ground at a distance of 5 feet from the base of the tree. The base of the tree and the ground form a right angle as shown. Write the distance, in feet, between the ground and the top of the ladder.

Answer Key Question 6 Item Claim Domain Target DOK #9 1 G H 2

Answer Key Question 6 Item Claim Domain Target DOK #9 1 G H 2 CONTEN T 8. G. B. 7 MP Key N/A 12 Key: 12 or its equivalent Rubric: (1 point) Student enters the correct distance

Question Number 7 The points show different locations in Joe's town. Each unit represents

Question Number 7 The points show different locations in Joe's town. Each unit represents 1 mile. Write the shortest distance, in miles, between Joe's home and the park. Round your answer to the nearest tenth.

Answer Key Question 7 Item Claim Domain Target DOK #10 1 G H 2

Answer Key Question 7 Item Claim Domain Target DOK #10 1 G H 2 CONTEN T 8. G. B. 8 MP Key N/A 3. 6 Key: 3. 6 Rubric: (1 point) Student enters the distance rounded to the nearest tenth of a mile.

Question Number 8 A cone with radius 4 feet is shown. Its approximate volume

Question Number 8 A cone with radius 4 feet is shown. Its approximate volume is 165 cubic feet. Write the height of the cone, in feet. Round your answer to the nearest hundredth.

Answer Key Number 8 Item Claim Domain Target DOK #11 1 G I 2

Answer Key Number 8 Item Claim Domain Target DOK #11 1 G I 2 CONTEN T 8. G. C. 9 MP Key 6 9. 84 – 9. 85 Key: 9. 84 -9. 85 Rubric: (1 point) Student enters the correct height within the indicated range (to accommodate different acceptable values of pi)

Question Number 9 Joe solved this linear system correctly. 6 x + 3 y

Question Number 9 Joe solved this linear system correctly. 6 x + 3 y = 6 y = -2 x + 2 These are the last two steps of his work. 6 x – 6 x + 6 = 6 6=6 Which statement about this linear system must be true? a. x must equal 6 b. y must equal 6 c. There is no solution to this system. d. There are infinitely many solutions to this system.

Answer Key Number 9 Item Claim #13 1 Domai n EE Target DOK D

Answer Key Number 9 Item Claim #13 1 Domai n EE Target DOK D 2 CONTEN T 8. EE. C. 8 b MP Key N/A D Key: D Rubric: (1 point) Student selects the correct statement

Question Number 10 An empty corn silo in the shape of a cylinder is

Question Number 10 An empty corn silo in the shape of a cylinder is being filled with corn. The silo is filled at a constant rate for a total of 10 hours. The table shows the amount of corn, in cubic feet, in the silo at the given number of hours after filling started. Write the percent of the silo that is filled with corn at 10 hours.

Answer Key Number 10 Item #25 Clai m 4 Domai n G, RP Targ

Answer Key Number 10 Item #25 Clai m 4 Domai n G, RP Targ et A DOK CONTENT MP Key 2 8. G. C. 9, 7. RP. A. 3 1, 4 90. 9 – 91 Key: 90. 9 -91 Rubric: (2 points) Student enters a correct numerical value for the percent of volume that is filled at the end of 10 hours (accept values in the range 90. 9 -91) (1 point) Student gives the amount filled after 10 hours (8250) but forgets to find the percentage of the filled amount to the volume OR student find the volume of the silo only (9072. 9 -9073)

Question Number 11 The table shows the relationship between the average number of hours

Question Number 11 The table shows the relationship between the average number of hours students study for a mathematics test and their average grade. Which type of function is most likely to model these data? a. Linear function with positive slope b. Linear function with negative slope c. Non-linear function that decreases then increases

Answer Key Number 11 Item Claim Domain Target DOK #23 4 F D 2

Answer Key Number 11 Item Claim Domain Target DOK #23 4 F D 2 CONTEN T 8. F. B. 5 MP Key 4 D Key: D Rubric: (1 point) Student selects the correct type of function

Question Number 12 Two figures are shown on the coordinate grid. Show that Figure

Question Number 12 Two figures are shown on the coordinate grid. Show that Figure A and Figure B are congruent by describing a sequence of basic transformations that maps Figure A onto Figure B. In your response, be sure to identify the transformations in the order they are performed.

Answer Key Number 12 Item Claim #20 3 Domai n G Target DOK B

Answer Key Number 12 Item Claim #20 3 Domai n G Target DOK B 3 CONTEN T 8. G. A. 2 MP Key 1, 2, See 3 exemplar st nd Exemplar 1: 1 transformation is to reflect over the y-axis. 2 transformation is to rotate 90º counter-clockwise about the origin. 3 rd transformation is to translate right by 2 units. Exemplar 2: 1 st transformation is to reflect over the x-axis. 2 nd transformation is to rotate 90º clockwise about the origin. 3 rd transformation is to translate right by 2 units. Other correct series of transformation are possible. Rubric: (2 points) Student describes three transformations with sufficient detail to prove that Figure A and Figure B are congruent. (1 point) Student either describes all three transformation in general terms, without the degree of precision necessary to prove congruency (e. g. rotation, reflection, and translation) or correctly describes two out of the three

Question Number 13 Consider this equation: c = ax – bx Joseph claims that

Question Number 13 Consider this equation: c = ax – bx Joseph claims that if a, b, and c are non-negative integers, then the equation has exactly one solution for x. Select all cases that show Joseph's claim is incorrect. a. A – b =1, c = 0 b. A = b, c ≠ 0 c. A = b, c=0 d. A = b, c ≠ 0 e. a – b , c = f. a ≠ b, c = 0

Answer Key Number 13 Item Claim Domai n Target DOK CONTEN T MP #18

Answer Key Number 13 Item Claim Domai n Target DOK CONTEN T MP #18 3 EE D 3 8. EE. C. 7 a 1, 3 Exemplar: (shown at right) Rubric: (1 point) Student correctly selects the second and third options. Key See exemplar

Question Number 14 Claire is filling bags with sand. All the bags are the

Question Number 14 Claire is filling bags with sand. All the bags are the same size. Each bag must weigh less than 50 pounds. One sand bag weighs 58 pounds, another sand bag weighs 41 pounds, and another sand bag weighs 53 pounds. Explain whether Claire can pour sand between sand bags so that the weight of each bag is less than 50 pounds.

Answer Key Number 14 Item Claim #31 2 Domai n Target 2 A DOK

Answer Key Number 14 Item Claim #31 2 Domai n Target 2 A DOK 3 CONTEN T 6. SP. 3 MP Key See Below Sample top-score response: since the mean is more than 50, (58+41+53)/3=50 2/3 pounds, it is not possible to move sand between bags so that each sandbag weighs no more than 50 pounds. For full credit: The response demonstrates a full and complete understanding of solving problems of this type. The response contains the following evidence: Student provides sufficient support for the conclusion that it is not possible to have less than 50 pounds or less in each sandbag (e. g. applying the mean, explaining how much weight cannot be

Question Number 15

Answer Key Number 15 Item Claim #16 3 Domai n G Target DOK G

Answer Key Number 15 Item Claim #16 3 Domai n G Target DOK G 3 Exemplar: (shown at right) Rubric: (1 point) Student correctly selects the second and fourth statements. CONTEN MP T 8. G. A. 3 2 Key See exemplar