Let's break this down. We're going to add 3261 and 3004 together.

Step 1: We'll start by adding the digits 1 & 4 in column 1 and get 5.

Step 2: We'll start by adding the digits 6 & 0 in column 2 and get 6.

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

Step 4: We'll start by adding the digits 3 & 3 in column 4 and get 6.

So, 3261 + 3004 = 6265.

