OK, let's do this. We've got 2000 and 1285 and we're adding them all together.

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 0 & 8 in column 2 and get 8.

Step 3: We'll start by adding the digits 0 & 2 in column 3 and get 2.

Step 4: We'll start by adding the digits 2 & 1 in column 4 and get 3.

So, 2000 + 1285 = 3285.

