Addition: Simple addition

Let's solve this problem step by step.

Step 1: Identify the numbers to be added:
We have $55$ and $40$.

Step 2: Perform the addition:
- Align the numbers according to their place values:
    $55$
+ $40$
-----------
- Add the digits in the ones place: $5 + 0 = 5$
- Add the digits in the tens place: $5 + 4 = 9$
Thus, combining these, the sum is $95$.

Therefore, the solution to the problem $55 + 40$ is $95$.

To solve this problem, we'll follow these steps:

• Step 1: Identify the numbers to add, which are $10$ and $34$.

• Step 2: Perform the addition of these numbers.

Now, let's work through these steps:

Step 1: We have the numbers $10$ and $34$ to be added.

Step 2: Align the numbers vertically as follows:

$\begin{array}{c} 10 \\ +34~~~ \\ \hline \end{array}$

Start adding from the rightmost digits:
$0 + 4 = 4$
In this case, there is no carry-over.
Now add the next column on the left:
$1 + 3 = 4$

Therefore, the final sum is $44$.

Step 3: Ensure that $44$ matches the provided answer choice. Indeed, option 4 corresponds to our calculation.

Therefore, the solution to the problem is $44$.

To solve the addition problem $22 + 36$, we will follow these steps:

• Step 1: Align the numbers vertically based on place value:

  22
+36
----

Step 2: Begin adding from the rightmost column, which is the units place:

Units: $2 + 6 = 8$. Write 8 under the line in the units place.

Step 3: Move to the tens column:

Tens: $2 + 3 = 5$. Write 5 under the line in the tens place.

At this point, we have summed the digits in each column and written the final result below the other numbers.

  22
+36
----
  58

Therefore, the sum of 22 and 36 is $\mathbf{58}$.

The correct answer is

$58$

.

Let's solve this problem using basic addition:

• Step 1: Write down the numbers 35 and 22 with the units and tens places aligned:

 35
+22
----

• Step 2: Start by adding the units place digits: $5 + 2 = 7$.
• Step 3: Add the tens place digits: $3 + 2 = 5$.

Combine the results to get the final sum:

 35
+22
----
 57

Therefore, the solution to the problem is $57$, which corresponds to choice 2.

To solve the addition problem $43 + 51$, we'll follow these steps:

• Step 1: Align the numbers vertically by their place value (units, tens).
• Step 2: Start adding from the rightmost column, which is the units column, and proceed to the leftmost column (tens).

Let's perform the addition:
Step 1: Align the numbers:
    43
+  51
------

Step 2: Add the units column: $3 + 1 = 4$. Write 4 in the units place.
Add the tens column: $4 + 5 = 9$. Write 9 in the tens place.

Thus, the sum of 43 and 51 is $94$.

The correct answer is $94$, which corresponds to choice 1.