Solve Vertical Addition: 75 + 15 Step-by-Step

$\begin{aligned} &75 \\ +& \\ &15 \\ &\underline{\phantom{776}} & \\ \end{aligned}$

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

• Step 1: Align the numbers by place value:
  $\begin{aligned} &75 \\ + &15 \\ \end{aligned}$

• Step 2: Add the units digits: $5 + 5 = 10$. Write down $0$ in the units place and regroup by carrying over $1$ to the tens place.

• Step 3: Add the tens digits, including the carry: $7 + 1 + 1 = 9$.

By following these steps, the sum of $75$ and $15$ is $90$.

Therefore, the solution to the problem is $90$.