Solve Vertical Addition: 45 + 5 Step-by-Step

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

• Step 1: Add the ones place digits.
• Step 2: If needed, adjust by carrying over any excess to the tens place.
• Step 3: Add the tens place digits.

Now, let's work through each step:
Step 1: We start by adding the digits in the ones place: $5 + 5 = 10$. Since $10$ is greater than $9$, we write down $0$ in the ones place and carry over $1$ to the tens place.
Step 2: Then, add the tens place digits. The tens digit of 45 is 4, and we add the carried over 1: $4 + 1 = 5$.
Step 3: Therefore, after adding, the complete sum is $50$.

Thus, the solution to the problem is $50$, which corresponds to choice 4.