Let's break this down. We're going to add 6011 and 2280 together.

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

Step 2: We'll start by adding the digits 1 & 8 in column 2 and get 9.

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 6 & 2 in column 4 and get 8.

So, 6011 + 2280 = 8291.

