Here we go! We're going to add 7000 and 223 together.

Step 1: We'll start by adding the digits 0 & 3 in column 1 and get 3.

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 0 & 2 in column 3 and get 2.

Step 4: We'll start by adding the digits 7 & 0 in column 4 and get 7.

So, 7000 + 223 = 7223.

