No problem, let's work through this together. We're starting with 11 and 403 and adding them all up.

Step 1: We'll start by adding the digits 1 & 3 in column 1 and get 4.

Step 2: We'll start by adding the digits 1 & 0 in column 2 and get 1.

Step 3: We'll start by adding the digits 0 & 4 in column 3 and get 4.

So, 11 + 403 = 414.

