Multiple-Choice Items:
- To describe the prevailing wind direction in one location, a meteorologist assigned positive values (+) for east and negative values (−) for west.
The table shows the speed and direction of the wind over a one-week period.
Prevailing Wind Direction for One Week
|
Day
|
Direction
|
Average Speed (mph)
|
Monday
|
east
|
18
|
Tuesday
|
east
|
11
|
Wednesday
|
west
|
15
|
Thursday
|
east
|
6
|
Friday
|
west
|
8
|
Saturday
|
west
|
22
|
Sunday
|
east
|
9
|
For this week, what was the net wind speed?
- 99
- 44
- −1
- −45
- You are going on a hiking trip. The overnight temperature may be as low as −10°C. You have sleeping bags with temperature ratings of 0°C, −5°C, 10°C, and −15°C. Which bag should you take?
- the 0°C-rated bag
- the −5°C-rated bag
- the 10°C-rated bag
- the −15°C-rated bag
- Two kilometers above ground, the temperature is 0°C. For each kilometer of height above ground, the temperature drops 7 degrees. What is the temperature 13 kilometers above ground?
- 0°C
- −77°C
- 91°C
- −91°C
- Scott thought he had $27 in his checking account, and he wrote a check for $12 to buy a new CD. On the way home, Scott remembered that he had withdrawn $20 the day before. What is the minimum amount Scott must quickly deposit in his account to make sure there is enough money for the check he wrote?
- $3
- $5
- $12
- $19
- An aircraft flying 1000 feet above ground began climbing at a rate of 300 feet per minute for 5 minutes. Then the aircraft descended at 100 feet per minute for
18 minutes. How many feet above ground was the aircraft flying after climbing and descending?
- 300 feet
- 700 feet
- 1000 feet
- 2300 feet
- The temperature on Mars ranges between −94°F at night and 72°F during the day. What is the temperature range in a single day?
- 18°F
- 22°F
- 72°F
- 166°F
- Simplify
- −2
- 2
- −20
- 20
- Simplify (−18)(−2)
- −36
- −9
- 9
- 36
- Simplify (14)(−3) + (4)(−12)
- −90
- −6
- 3
- −50
Multiple Choice Answer Key:
1. C
|
2. D
|
3. B
|
4. B
|
5. B
|
6. D
|
7. C
|
8. D
|
9. A
|
|
Short-Answer Items:
10. Simplify the expression . Show each step in the process. Explain each step.
11. Write a short paragraph explaining what kinds of real-life situations and applications negative numbers can represent. Back up your explanation with a specific example showing how negative numbers affect the real-life situation.
12. Write a story problem that would represent the following calculation:
7 + (−10) + 4 + 20 + (−25). Show the solution to your story problem.
Short-Answer Key and Scoring Rubrics:
10. Simplify the expression . Show each step in the process. Explain each step.
Example 1: −8 × 5 = −40; 4 + (−5) = −1; and −40 ÷ −1 = 40
Example 2: 4 + (−5) = −1; −8 ÷ −1 = 8; and 8 × 5 = 40
Example 3: 4 + (−5) = −1; 5 ÷ −1 = −5; and −8 × −5 = 40
Points
|
Description
|
2
|
- The student correctly simplifies the expression to 40.
- The student shows all three calculations; all mathematical calculations are accurate; and negative signs are correctly used.
- Each step includes adequate explanation.
|
1
|
- The student incorrectly simplifies the expression.
- The student shows all three calculations; two of the three mathematical calculations are accurate; and negative signs are correctly used.
- Two of the three steps include adequate explanation.
|
0
|
- The student incorrectly simplifies the expression.
- The student fails to show all three calculations; one or none of the three mathematical calculations are accurate; and negative signs are incorrectly used.
- No part of the explanation is accurate or adequate.
|
11. Write a short paragraph explaining what kinds of real-life situations and applications negative numbers can represent. Back up your explanation with a specific example showing how negative numbers affect the real-life situation. Answers will vary.
Points
|
Description
|
2
|
- The student’s answer is complete and accurate.
- The student’s explanation makes logical sense.
- Specific examples are present to show understanding of how negative numbers affect real-life situations.
|
1
|
- The student’s answer is partially correct and accurate.
- The student’s explanation is partially correct, but logical errors may exist and/or parts are missing. For example, the student may include the addition of a negative number without indicating that the number must be subtracted.
- Some understanding of how negative numbers affect real-life situations is evident.
|
0
|
- The student’s answer is missing, incomplete, or inaccurate.
- No explanation is provided. For example, the student may add negative numbers inappropriately by adding rather than subtracting.
- The provided answer shows little to no understanding of how negative numbers affect real-life situations.
|
12. Write a story problem that would represent the following calculation:
7 + (−10) + 4 + 20 + (−25). Show the solution to your story problem. Answers will vary.
Points
|
Description
|
2
|
- The student creates a credible story problem for the sum of 7, −10, 4, 20, and −25.
- The student calculates the correct sum (−4) with all work evident.
|
1
|
- The student creates a story problem that begins appropriately but has errors or missing parts. For example, the student may represent
7 + (−10) as indicative of an initial temperature of positive 7 degrees that then drops to negative 10 degrees, rather than the initial temperature of 7 degrees decreasing by 10 degrees.
- The sum may be incorrect due to a minor calculation error.
|
0
|
- The student does not provide a story problem, or the provided story problem is illogical or unclear.
- The solution is not present or the sum is incorrect due to major calculation error(s).
|
Performance Assessment:
Be the Club Treasurer! Keeping It Balanced
Suppose you are the treasurer of a club. The club has a checking account balance of $74. You have paid bills in the amounts of $17, $14, and $25 for supplies. You have collected dues of $6 from 7 different members. You are to deposit the collected dues into the account.
- Create a table that shows the account transactions described above.
- In words, how do you find the new balance?
- If the bank charged a $10 service fee, find the current balance.
Performance Assessment Scoring Rubric:
Points
|
Description
|
4
|
- Table shows beginning balance of $74.
- Table shows deductions of $17, $14, and $25 as debits or subtracted from the beginning balance.
- Table shows 7 discrete dues entries for $6 totaling $42 as a credit or added to the balance OR $42 associated with 7 members and credited to the balance.
- Table shows $10 fee as a debit or subtracted from the balance.
- Table shows current balance of $50.
- Explanation shows clear understanding of adding and subtracting positive and negative numbers.
|
3
|
- Table shows beginning balance of $74.
- Table shows subtraction of 17, 14, and 25.
- Table shows addition of 42.
- Table shows subtraction of 10.
- Table shows incorrect current balance due to minor computation error.
- Explanation shows some understanding of adding and subtracting positive and negative numbers.
|
2
|
- Table shows beginning balance of $74.
- Table shows some of the necessary steps.
- No more than 2 of the required steps are missing.
- A few minor computation errors may be present, but no more than one major computation error is present.
- Explanation shows basic understanding of adding and subtracting positive and negative numbers.
|
1
|
- Student work is incomplete.
- Some of the necessary steps are present but major computation errors may be present.
- Supporting work shown does not necessarily contribute to the solution.
- Table shows incorrect current balance.
- Explanation shows little understanding of adding and subtracting positive and negative numbers.
|
0
|
- Student work has incorrect balance.
- Supporting work is insufficient to indicate engagement with the concept of adding and subtracting to find the current balance.
- Explanation shows no understanding of adding and subtracting positive and negative numbers.
|