Let's break this down. We're going to add 8011 and 245 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 1 & 4 in column 2 and get 5.

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 8 & 0 in column 4 and get 8.

So, 8011 + 245 = 8256.

