No problem, let's work through this together. We're starting with 6270 and 2105 and adding them all up.

Step 1: We'll start by adding the digits 0 & 5 in column 1 and get 5.

Step 2: We'll start by adding the digits 7 & 0 in column 2 and get 7.

Step 3: We'll start by adding the digits 2 & 1 in column 3 and get 3.

Step 4: We'll start by adding the digits 6 & 2 in column 4 and get 8.

So, 6270 + 2105 = 8375.

