Let's break this down. We're going to add 2045 and 5221 together.

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

Step 2: We'll start by adding the digits 4 & 2 in column 2 and get 6.

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 2 & 5 in column 4 and get 7.

So, 2045 + 5221 = 7266.

