Answer :
- Verify the subtraction by checking if the sum of the parts equals the whole: $197 + 55 = 252$.
- Verify the subtraction by subtracting the result from the whole: $252 - 55 = 197$.
- The other equations are not relevant for verifying the calculation.
- The equations that can be used to verify the calculation are $197+55=252$ and $252-55=197$.
### Explanation
1. Problem Analysis
Let's analyze Roberto's newspaper delivery problem. He starts with 252 newspapers and has already delivered 197. He calculates that he has 55 left to deliver. To verify his subtraction, we need to check which of the given equations are correct.
2. Verification using Addition
We can verify Roberto's calculation by checking if the sum of the newspapers he has already delivered (197) and the newspapers he still needs to deliver (55) equals the total number of newspapers (252). So, we need to check if $197 + 55 = 252$. The result of the addition is 252, so this equation is correct.
3. Verification using Subtraction
Another way to verify the calculation is to subtract the number of newspapers left to deliver (55) from the total number of newspapers (252). This should equal the number of newspapers already delivered (197). So, we need to check if $252 - 55 = 197$. The result of the subtraction is 197, so this equation is also correct.
4. Checking Other Equations
Now, let's check the other equations:
* $197 - 55 = 142$. This is not related to verifying the original calculation.
* $252 + 197 = 449$. This is also not related to verifying the original calculation.
* $55 + 55 = 110$. This is not related to verifying the original calculation.
5. Final Answer
Therefore, the equations that Roberto can use to verify his calculation are $197 + 55 = 252$ and $252 - 55 = 197$.
### Examples
Imagine you're managing inventory at a store. You start with a certain number of items, sell some, and want to make sure your count of remaining items is correct. Just like Roberto verifying his newspaper count, you can use addition and subtraction to double-check your inventory. If you started with 100 items, sold 30, and think you have 70 left, you can verify this by checking if 30 + 70 = 100 or if 100 - 30 = 70. This helps prevent errors and ensures accurate stock management.
- Verify the subtraction by subtracting the result from the whole: $252 - 55 = 197$.
- The other equations are not relevant for verifying the calculation.
- The equations that can be used to verify the calculation are $197+55=252$ and $252-55=197$.
### Explanation
1. Problem Analysis
Let's analyze Roberto's newspaper delivery problem. He starts with 252 newspapers and has already delivered 197. He calculates that he has 55 left to deliver. To verify his subtraction, we need to check which of the given equations are correct.
2. Verification using Addition
We can verify Roberto's calculation by checking if the sum of the newspapers he has already delivered (197) and the newspapers he still needs to deliver (55) equals the total number of newspapers (252). So, we need to check if $197 + 55 = 252$. The result of the addition is 252, so this equation is correct.
3. Verification using Subtraction
Another way to verify the calculation is to subtract the number of newspapers left to deliver (55) from the total number of newspapers (252). This should equal the number of newspapers already delivered (197). So, we need to check if $252 - 55 = 197$. The result of the subtraction is 197, so this equation is also correct.
4. Checking Other Equations
Now, let's check the other equations:
* $197 - 55 = 142$. This is not related to verifying the original calculation.
* $252 + 197 = 449$. This is also not related to verifying the original calculation.
* $55 + 55 = 110$. This is not related to verifying the original calculation.
5. Final Answer
Therefore, the equations that Roberto can use to verify his calculation are $197 + 55 = 252$ and $252 - 55 = 197$.
### Examples
Imagine you're managing inventory at a store. You start with a certain number of items, sell some, and want to make sure your count of remaining items is correct. Just like Roberto verifying his newspaper count, you can use addition and subtraction to double-check your inventory. If you started with 100 items, sold 30, and think you have 70 left, you can verify this by checking if 30 + 70 = 100 or if 100 - 30 = 70. This helps prevent errors and ensures accurate stock management.
