OK, let's do this. We've got 5331 and 3005 and we're adding them all together.

Step 1: We'll start by adding the digits 1 & 5 in column 1 and get 6.

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

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

Step 4: We'll start by adding the digits 5 & 3 in column 4 and get 8.

So, 5331 + 3005 = 8336.

