G3 U2 Assessment Key
Grade 3 Unit 2 Assessment Understanding Multiplication
Answer Key *All answers are worth 1 point unless otherwise noted* 1. A, C
2. A (True)
3. C
4. C
5. D
One or zero correct response = 0 points Both correct responses = 1 point
3.OA.1 6. B, C, E
3.OA.1 7. A (True)
3.OA.1 8. A (True)
3.OA.1 9. A (True)
3.OA.1 10. C
Two or fewer correct responses = 0 points Three correct responses = 1 point
3.OA.1 11. B
3.OA.5 12. C
3.OA.5 13. A
3.OA.5 14. D
3.OA.1 15. Check drawings for one array with 6 rows of 7 and a second array with 7 rows of 6
Incorrect response = 0 points
Incorrect response = 0 points
Incorrect response = 0 points
Incorrect response = 0 points
Correct response = ¼ point
Correct response = ¼ point
Correct response = ¼ point
Correct response = ¼ point
Two incomplete/ incorrectly drawn arrays = 0 points One correctly drawn array = ½ point Two correctly drawn arrays = 1 point
3.OA.5
3.OA.5
3.OA.5
3.OA.5
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3.OA.1
16.
17. Either
18. 24
Answers will vary.
3+3+3+3+3
Possible answer: The array could be doubled so there are 4 rows of 5. The total in the new array would be 20.
OR 5+5+5
19. 4, 4
20.
Strategies will vary, and could include an array, repeated addition, or one of the properties of multiplication.
Check drawings for one array with 4 rows of 8 and a second array with 8 rows of 4.
To receive credit, students must demonstrate that they have applied a strategy.
Inaccurate response = 0 points
Incorrect response = 0 points
Incorrect response = 0 points
One or zero correct responses = 0 points
Accurate response = 1 point
Correct response = 1 point
Correct response with inaccurate/incomplete application of a strategy = 0 points
Both correct responses = 1 point
3.OA.5
21. Either
3.OA.5 22. 6 × 3
3×2×8=8×3×2 OR
One correctly drawn array = ½ point Two correctly drawn arrays = 1 point
Correct response with accurate application of a strategy = 1 point
3.OA.1
Two incomplete/ incorrectly drawn arrays = 0 points
3.OA.5
3.OA.1
23. Either
Incorrect response = 0 points
5+5+5+5+5+5+5+5+5
Correct response = 1 point
OR
3×2×8=2×3×8
9+9+9+9+9
Incorrect response = 0 points
Incorrect response = 0 points
Correct response = 1 point
Correct response = 1 point
3.OA.1
3.OA.5
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3.OA.1
Question 24. Student gives correct answers: (Arrays should be drawn for each arrangement): 1 row of 18 seeds, 6 rows of 3 seeds, 3 rows of 6 seeds, 9 rows of 2 seeds, 2 rows of 9 seeds, and 18 rows of 1 seed. There are six possible arrangements for the seeds. 25. a. Student completes equation correctly: ( 5 × 3) × 7= 5 × (3 × 7) b. Student gives accurate explanation: Sample explanation: To solve this problem, I used the Associative Property of Multiplication because the parenthesis representing the grouping of the numbers changed positions but the numbers themselves did not change. c. Student gives accurate explanation: Sample explanation: One similarity is that both sides of the equation have the same numbers and operations. Even though the groupings are different on each side, their product is still the same. 26. a. Student gives correct answers: Possible answer: Decompose 11 = 5 + 6; Two new number sentences 5 × 2 = 10 and 6 × 2 = 12 b. Student gives accurate explanation: To check that my answers are correct, I will add the products of the two new number sentences I wrote. If their sum is equal to the product of the original equation, then I know my work is correct. c. Student shows work and confirms that their answers are correct.
Points 1 for 3 correct responses,
2 for 6 correct responses
0.5 0.5
1 1 0.5
0.5
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Answer Key *All answers are worth 1 point unless otherwise noted* 1. A, C
2. A (True)
3. C
4. C
5. D
One or zero correct response = 0 points Both correct responses = 1 point
3.OA.1 6. B, C, E
3.OA.1 7. A (True)
3.OA.1 8. A (True)
3.OA.1 9. A (True)
3.OA.1 10. C
Two or fewer correct responses = 0 points Three correct responses = 1 point
3.OA.1 11. B
3.OA.5 12. C
3.OA.5 13. A
3.OA.5 14. D
3.OA.1 15. Check drawings for one array with 6 rows of 7 and a second array with 7 rows of 6
Incorrect response = 0 points
Incorrect response = 0 points
Incorrect response = 0 points
Incorrect response = 0 points
Correct response = ¼ point
Correct response = ¼ point
Correct response = ¼ point
Correct response = ¼ point
Two incomplete/ incorrectly drawn arrays = 0 points One correctly drawn array = ½ point Two correctly drawn arrays = 1 point
3.OA.5
3.OA.5
3.OA.5
3.OA.5
Copyright © Swun Math Grade 3 Unit 2 Assessment (Answer Key) Page 1
3.OA.1
16.
17. Either
18. 24
Answers will vary.
3+3+3+3+3
Possible answer: The array could be doubled so there are 4 rows of 5. The total in the new array would be 20.
OR 5+5+5
19. 4, 4
20.
Strategies will vary, and could include an array, repeated addition, or one of the properties of multiplication.
Check drawings for one array with 4 rows of 8 and a second array with 8 rows of 4.
To receive credit, students must demonstrate that they have applied a strategy.
Inaccurate response = 0 points
Incorrect response = 0 points
Incorrect response = 0 points
One or zero correct responses = 0 points
Accurate response = 1 point
Correct response = 1 point
Correct response with inaccurate/incomplete application of a strategy = 0 points
Both correct responses = 1 point
3.OA.5
21. Either
3.OA.5 22. 6 × 3
3×2×8=8×3×2 OR
One correctly drawn array = ½ point Two correctly drawn arrays = 1 point
Correct response with accurate application of a strategy = 1 point
3.OA.1
Two incomplete/ incorrectly drawn arrays = 0 points
3.OA.5
3.OA.1
23. Either
Incorrect response = 0 points
5+5+5+5+5+5+5+5+5
Correct response = 1 point
OR
3×2×8=2×3×8
9+9+9+9+9
Incorrect response = 0 points
Incorrect response = 0 points
Correct response = 1 point
Correct response = 1 point
3.OA.1
3.OA.5
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3.OA.1
Question 24. Student gives correct answers: (Arrays should be drawn for each arrangement): 1 row of 18 seeds, 6 rows of 3 seeds, 3 rows of 6 seeds, 9 rows of 2 seeds, 2 rows of 9 seeds, and 18 rows of 1 seed. There are six possible arrangements for the seeds. 25. a. Student completes equation correctly: ( 5 × 3) × 7= 5 × (3 × 7) b. Student gives accurate explanation: Sample explanation: To solve this problem, I used the Associative Property of Multiplication because the parenthesis representing the grouping of the numbers changed positions but the numbers themselves did not change. c. Student gives accurate explanation: Sample explanation: One similarity is that both sides of the equation have the same numbers and operations. Even though the groupings are different on each side, their product is still the same. 26. a. Student gives correct answers: Possible answer: Decompose 11 = 5 + 6; Two new number sentences 5 × 2 = 10 and 6 × 2 = 12 b. Student gives accurate explanation: To check that my answers are correct, I will add the products of the two new number sentences I wrote. If their sum is equal to the product of the original equation, then I know my work is correct. c. Student shows work and confirms that their answers are correct.
Points 1 for 3 correct responses,
2 for 6 correct responses
0.5 0.5
1 1 0.5
0.5
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