Solve Three-Digit Addition: 772 + 135 in Vertical Format

To solve this problem, we'll use a step-by-step vertical addition approach:

Step 1: Add the units place digits.

The units digit of $772$ is $2$, and that of $135$ is $5$. Adding these gives:

$2 + 5 = 7$

Step 2: Add the tens place digits, including any carry from the units place.

The tens digit of $772$ is $7$, and that of $135$ is $3$. Since there is no carry from the units place, we simply add the two digits:

$7 + 3 = 10$

We write down $0$ in the tens place and carry over $1$ to the hundreds place.

Step 3: Add the hundreds place digits, including any carry from the tens place.

The hundreds digit of $772$ is $7$, and that of $135$ is $1$. Including the carry of $1$, we perform the addition:

$7 + 1 + 1 = 9$

Therefore, there is no additional carry to move forward.

Bringing all parts together, we form the resulting number. Hence, the sum is:

$907$