G6 U2 Assessment Key
Grade 6 Unit 2 Assessment Rational Numbers
Answer Key 1.
D
2.
6.NS.7 6.
C 6.NS.6
11. B, C
A
3.
6.NS.6 7.
D
C 6.NS.5
8.
6.NS.5
D 6.NS.7
12. A, B, D
13.
One or zero correct responses = 0 points
Two or fewer correct responses = 0 points
One or zero correct responses = 0 points
Both correct responses = 1 point
All three correct responses = 1 point
Both correct responses = 1 point
6.NS.5
6.NS.5
4.
A, C
5. B 6.NS.5 9.
6.NS.7
B
10.
6.NS.7 14. 0:
d, e, g, m, o a, f, i, l b, c, h, j, k, n
Fourteen or fewer correct responses = 0 points Fifteen correct responses = 1 point
6.NS.5 16. a. > b. = c. < d. >
Burt’s debt is $15.
B 6.NS.7
6.NS.6
15.
B
Incorrect response and/or inaccurate/incomplete number line = 0 points
Three or fewer correct responses = 0 points
Correct response and accurate number line = 1 point
All four correct responses = 1 point
17.
|100|, |-25|, |14|, |-6|
Incorrect response = 0 points Correct response = 1 point
6.NS.7
6.NS.7
Copyright © Swun Math Grade 6 Unit 2 Assessment (Answer Key) Page 1
6.NS.7
18.
19.
Four or fewer points plotted correctly = 0 points
31¼ inches
20.
a. 8 or 9 b. 0, 1, 2, or 3 c. 0 or 1
Incorrect response = 0 points
Incorrect response = 0 points
Correct response = 1 point
Correct response = 1 point
All five points plotted correctly = 1 point
6.NS.6
6.NS.7
6.NS.7
Question: 21. a. Student creates an accurate visual model: Student drawings may vary, however they should represent a number line showing the position of each number at, above, or below zero. b. Student gives an accurate explanation: Sample explanation: The model represents the elevation above and below sea level of three places Marianne and her dad were on their trip. When they were on the boat they were at sea level, which is 0 feet in elevation. Their dive to 20 feet below sea level is represented by the point at negative 20 feet on the number line because they were moving in the negative direction away from sea level. Their house is located above sea level, at the point represented at positive 45 feet. The difference between their highest and lowest elevations is 65 feet. 6.NS.5
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Points 1
1
22. a. Student draws an accurate number line: Number line should be labelled with each child’s name and growth. Because growth rates are positive, values should all be placed in positions to the right of zero on the number line. b. Student gives the correct answer: 2 > 0.5 c. Student gives the correct answer: 2 < 2.25 d. Student gives the correct answer and an accurate explanation: Sample explanation: The child with the greatest growth was Jesse with 2.5 inches. It is not possible for Jesse’s growth to be the opposite in value in the next six months because a person’s growth can’t be negative. A child can grow taller, but he can’t grow shorter. 6.NS.7 23. Student gives the correct answer and an accurate explanation: Sample explanation: After analyzing Mark’s work I concluded that his answer is incorrect. When comparing negative numbers, a larger number is not greater in value than a smaller number. When working with negative numbers, the greater the number, the less it is valued because it is farther away from zero in the negative direction. Smaller negative numbers are closer to zero and have greater value. So, in the case of temperature, the larger the negative number, the farther away it is from zero and the colder the temperature. The correct answer to the problem is ‒16°F < ‒5°F. -16°F is colder than ‒5°F. 6.NS.7
Copyright © Swun Math Grade 6 Unit 2 Assessment (Answer Key) Page 3
0.5
0.5 0.5 0.5
2
Answer Key 1.
D
2.
6.NS.7 6.
C 6.NS.6
11. B, C
A
3.
6.NS.6 7.
D
C 6.NS.5
8.
6.NS.5
D 6.NS.7
12. A, B, D
13.
One or zero correct responses = 0 points
Two or fewer correct responses = 0 points
One or zero correct responses = 0 points
Both correct responses = 1 point
All three correct responses = 1 point
Both correct responses = 1 point
6.NS.5
6.NS.5
4.
A, C
5. B 6.NS.5 9.
6.NS.7
B
10.
6.NS.7 14. 0:
d, e, g, m, o a, f, i, l b, c, h, j, k, n
Fourteen or fewer correct responses = 0 points Fifteen correct responses = 1 point
6.NS.5 16. a. > b. = c. < d. >
Burt’s debt is $15.
B 6.NS.7
6.NS.6
15.
B
Incorrect response and/or inaccurate/incomplete number line = 0 points
Three or fewer correct responses = 0 points
Correct response and accurate number line = 1 point
All four correct responses = 1 point
17.
|100|, |-25|, |14|, |-6|
Incorrect response = 0 points Correct response = 1 point
6.NS.7
6.NS.7
Copyright © Swun Math Grade 6 Unit 2 Assessment (Answer Key) Page 1
6.NS.7
18.
19.
Four or fewer points plotted correctly = 0 points
31¼ inches
20.
a. 8 or 9 b. 0, 1, 2, or 3 c. 0 or 1
Incorrect response = 0 points
Incorrect response = 0 points
Correct response = 1 point
Correct response = 1 point
All five points plotted correctly = 1 point
6.NS.6
6.NS.7
6.NS.7
Question: 21. a. Student creates an accurate visual model: Student drawings may vary, however they should represent a number line showing the position of each number at, above, or below zero. b. Student gives an accurate explanation: Sample explanation: The model represents the elevation above and below sea level of three places Marianne and her dad were on their trip. When they were on the boat they were at sea level, which is 0 feet in elevation. Their dive to 20 feet below sea level is represented by the point at negative 20 feet on the number line because they were moving in the negative direction away from sea level. Their house is located above sea level, at the point represented at positive 45 feet. The difference between their highest and lowest elevations is 65 feet. 6.NS.5
Copyright © Swun Math Grade 6 Unit 2 Assessment (Answer Key) Page 2
Points 1
1
22. a. Student draws an accurate number line: Number line should be labelled with each child’s name and growth. Because growth rates are positive, values should all be placed in positions to the right of zero on the number line. b. Student gives the correct answer: 2 > 0.5 c. Student gives the correct answer: 2 < 2.25 d. Student gives the correct answer and an accurate explanation: Sample explanation: The child with the greatest growth was Jesse with 2.5 inches. It is not possible for Jesse’s growth to be the opposite in value in the next six months because a person’s growth can’t be negative. A child can grow taller, but he can’t grow shorter. 6.NS.7 23. Student gives the correct answer and an accurate explanation: Sample explanation: After analyzing Mark’s work I concluded that his answer is incorrect. When comparing negative numbers, a larger number is not greater in value than a smaller number. When working with negative numbers, the greater the number, the less it is valued because it is farther away from zero in the negative direction. Smaller negative numbers are closer to zero and have greater value. So, in the case of temperature, the larger the negative number, the farther away it is from zero and the colder the temperature. The correct answer to the problem is ‒16°F < ‒5°F. -16°F is colder than ‒5°F. 6.NS.7
Copyright © Swun Math Grade 6 Unit 2 Assessment (Answer Key) Page 3
0.5
0.5 0.5 0.5
2
