Solve Vertical Addition: 12 + 88 Step by Step

To solve this problem, we'll follow a step-by-step vertical addition method:

• Step 1: Arrange the numbers vertically: $\begin{aligned} &12 \\ + & \\ &88 \\ \end{aligned}$ Make sure the digits of the numbers are aligned correctly: units under units and tens under tens.
• Step 2: Start by adding the numbers in the units place (rightmost column): $2 + 8 = 10$

Since $10$ is a two-digit number, write down $0$ in the units place under this column and carry over $1$ to the tens column (left). Carrying over is essential when the sum of any column exceeds 9.

• Step 3: Next, add the numbers in the tens place, don't forget adding the carry from the previous addition: $1 + 1 + 8 = 10$

As before, $10$ is a two-digit number. Write down $0$ in the tens place and carry over $1$ (although in this case, it gets added to a zero since this is the leftmost column, resulting in a new column).

Thus, the complete addition looks like this: $\begin{aligned} &12 \\ + & \\ &88 \\ & \underline{100} \end{aligned}$

Therefore, the correct solution to the problem is $100$, which corresponds to the answer choice provided.