OK, let's do this. We've got 1305 and 7023 and we're adding them all together.

Step 1: We'll start by adding the digits 5 & 3 in column 1 and get 8.

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

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 1 & 7 in column 4 and get 8.

So, 1305 + 7023 = 8328.

