Solve the Addition Problem: 11 + 29 = ?

To solve this problem, we'll break it down into manageable steps:

• Step 1: Identify the numbers involved in the addition. They are 11 and 29.
• Step 2: Add the units digits of both numbers. The numbers 11 and 29 have units digits of 1 and 9, respectively.

Let's add the units digits:

$1 + 9 = 10$

This results in a sum of 10. Place the 0 (which is the unit value) in the units place of the final answer, and carry over the 1 to the tens digit.

• Step 3: Add the tens digits of both numbers. The tens digits are 1 (from 11) and 2 (from 29). Don't forget to include the carry-over 1 from the previous step.

Let's add the tens digits, including the carry-over:

$1 + 2 + 1 = 4$

The result is 4, and there is no need to carry over this time.

Step 4: Combine the calculated digits. The tens digit is 4, and the units digit is 0 from our previous operation.

Thus, the final sum is $40$.

Therefore, the solution to the problem is $\mathbf{40}$.