All questions of Mixed Operations for Year 4 Exam

Understanding the Problem
To find out what must be added to 3956 to reach 6935, we need to perform a simple subtraction operation.
Step-by-Step Calculation
1. Identify the numbers:
- Current number: 3956
- Desired number: 6935
2. Perform the subtraction:
To find the amount to be added, subtract the current number from the desired number:
- Amount to be added = 6935 - 3956
3. Calculate:
- 6935 - 3956 = 2979
Conclusion
Thus, you need to add 2979 to 3956 to get 6935.
Verification of Options
Let’s examine the options given:
- Option a: 3956
- Not correct, as this is the starting number.
- Option b: 6935
- Not correct, as this is the target number.
- Option c: 2979
- Correct! This is the amount we calculated.
- Option d: 3979
- Not correct, as this does not satisfy the equation.
Final Answer
The correct option is C: 2979. This shows that adding 2979 to 3956 will indeed result in 6935.

Place value of 5 is 50000.
Place value of 2 is 2000.
Therefore, the difference between 50000 and 2000 is 48000.

Understanding the Total Votes Polled
In the given election scenario, a total of 27,895 votes were cast. This number includes both valid and invalid votes.
Identifying Invalid Votes
Among the total votes, 6,521 were identified as invalid. These are votes that could not be counted towards the final tally due to reasons such as being improperly filled out or not meeting voting requirements.
Calculating Valid Votes
To determine the number of valid votes, we need to subtract the invalid votes from the total votes.
Mathematical Calculation
- Total Votes: 27,895
- Invalid Votes: 6,521
Now, perform the subtraction:
- Valid Votes = Total Votes - Invalid Votes
- Valid Votes = 27,895 - 6,521
After performing the calculation, we find:
- Valid Votes = 21,374
Conclusion
The valid votes cast in the election amount to 21,374. Therefore, the correct answer is option 'C', which states that the number of valid votes is 21,374.
This calculation is crucial for determining the outcome of the election and understanding voter participation.

Understanding the Problem
The equation presented is:
6842 + ? = 6847
To find the missing number (?), we need to isolate it in the equation.
Step-by-Step Calculation
- Identify the Known Values:
We have two numbers: 6842 and 6847.
- Subtract the Known Number:
To find the unknown value, we will subtract 6842 from 6847.
6847 - 6842 = ?
- Perform the Subtraction:
Let's calculate:
6847 - 6842 = 5
Thus, the value of ? is 5.
Choosing the Correct Option
Now, we compare our result with the given options:
- a) 5
- b) 7
- c) 4
- d) 6
From our calculation, we see that the correct answer is option 'A', which is 5.
Conclusion
In conclusion, by following the steps of subtraction, we have determined that the missing number in the equation is 5. This process illustrates how to solve for an unknown in a simple addition equation.

Understanding the Problem
To find the difference between 4753 and 8000, we need to perform a simple subtraction. The difference will tell us how much 8000 exceeds 4753.
Calculation Steps
- Identify the Numbers:
- First number: 4753
- Second number: 8000
- Subtract the First Number from the Second Number:
- 8000 - 4753
Performing the Calculation
- Step 1: Align the numbers for subtraction:

8000
- 4753
- Step 2: Start subtracting from the rightmost digit:
- 0 - 3 cannot be done, so we borrow:
- Borrow from the next column, making it 10 for the current column.
- Now, 10 - 3 = 7.
- Step 3: Move to the next column:
- 9 (after borrowing) - 5 = 4.
- Step 4: Move to the next column:
- 9 - 7 = 2.
- Step 5: Finally, for the leftmost column:
- 7 - 4 = 3.
Putting it all together, we have:
8000
- 4753
--------
3247
Conclusion
The difference between 4753 and 8000 is 3247. This corresponds to option 'A'. Thus, when asked about the difference, the answer is:
- Correct Answer: 3247 (Option A)

Total Population Calculation
To find the total population of the three states in India, we need to add their individual populations together. Here are the populations of each state:
- State 1: 96,304,854
- State 2: 84,617,398
- State 3: 45,038,237
Step 1: Adding the Populations
Let's break down the addition step by step:
- First, add the populations of State 1 and State 2:
- 96,304,854 + 84,617,398 = 180,922,252
- Next, add the population of State 3 to the result:
- 180,922,252 + 45,038,237 = 225,960,489
Step 2: Final Result
The total population of the three states is:
- 225,960,489
Options Analysis
Now, let's look at the options given:
- a) 0235860489
- b) 225860489
- c) 225960489
- d) 225960499
The correct answer is option 'C' (225,960,489), as it matches our calculated total population.
Conclusion
Hence, the total population of the three states is accurately calculated as 225,960,489. Remember, careful addition is crucial to ensure you arrive at the correct answer.