Adding 5 Units to 75: Basic Number Addition Problem

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

• Step 1: Identify the given information
• Step 2: Apply the appropriate formula
• Step 3: Perform the necessary calculations

Now, let's work through each step:
Step 1: The problem gives us that we need to add the number 5 to the number 75.
Step 2: Applying basic addition, $a + b = c$, where $a = 75$ and $b = 5$.
Step 3: Perform the addition: $75 + 5 = 80$.

Therefore, the solution to the problem is $80$, which corresponds to choice 1.