Let's solve this addition problem. We have 6021 and 2002, and we need to add them together.

Step 1: We'll start by adding the digits 1 & 2 in column 1 and get 3.

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

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

Step 4: We'll start by adding the digits 6 & 2 in column 4 and get 8.

So, 6021 + 2002 = 8023.

