Solve Vertical Addition: 521 + 8 Step by Step

$\begin{aligned} &521 \\ +& \\ &~~~~8 \\ &\underline{\phantom{776}} & \\ \end{aligned}$

To solve this problem, we will add the numbers 521 and 8 using vertical addition:

• Step 1: Write the numbers in vertical form, aligning by the units place:

$\begin{array}{c} 521 \\ +~~8 \\ \hline \underline{\phantom{529}} \end{array}$

• Step 2: Add the digits in the units place: $1 + 8 = 9$. Write the result below the line in the units place.
• Step 3: Add the digits in the tens place: $2 + 0 = 2$. Write the result in the tens place.
• Step 4: Add the digits in the hundreds place: $5 + 0 = 5$. Write the result in the hundreds place.

Thus, the sum of 521 and 8 is $529$.

Therefore, the solution to the problem is $\boxed{529}$.