Here we go! We're going to add 8011 and 1240 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 & 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 & 1 in column 4 and get 9.

So, 8011 + 1240 = 9251.

