Unit 5, Lesson 7
Adding and Subtracting to Solve Problems
Grade 7
Practice
Problem 1
When the table here is complete, it shows four transactions and the resulting account balance in a bank account. Fill in the missing numbers.
| transaction amount | account balance | |
|---|---|---|
| transaction 1 | 360 | 360 |
| transaction 2 | -22.50 | 337.50 |
| transaction 3 | 182.35 | |
| transaction 4 | -41.40 |
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Problem 2
The departure from the average amount of rain is the difference between the actual amount of rain and the average amount of rain for a given month. The historical average for rainfall in Albuquerque, NM, for June, July, and August is shown in the table.
| June | July | August |
|---|---|---|
| 0.67 | 1.5 | 1.57 |
- Last June only 0.17 inches of rain fell all month. What is the difference between the average rainfall and the actual rainfall for last June?
- The departure from the average rainfall last July was -0.36 inches. How much rain fell last July?
- How much rain would have to fall in August so that the total amount of rain equals the average rainfall for these three months? What would the departure from the average be in August in that situation?
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Problem 3
A person travels from Lake Assal, Djibouti, where the elevation is -155 meters, to Elidar, Ethiopia, where the elevation is 418 meters. What is the difference between the person’s final elevation and their starting elevation?
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Problem 4
Tyler orders a meal that costs \$15.
- If the tax rate is 6.6%, how much will the sales tax be on Tyler’s meal?
- Tyler also wants to leave a tip for the server. How much do you think he should pay in all? Explain your reasoning.
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Problem 5
In a video game, a character is healed at a constant rate as long as they are standing in a certain circle. Complete the table.
| time in circle (seconds) |
health gained (points) |
|---|---|
| 4 | 100 |
| 10 | |
| 3 | |
| 1,000 |
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