Let's get this math done. We have 4002 and 4066 and we're going to add them all together.

Step 1: We'll start by adding the digits 2 & 6 in column 1 and get 8.

Step 2: We'll start by adding the digits 0 & 6 in column 2 and get 6.

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 4 & 4 in column 4 and get 8.

So, 4002 + 4066 = 8068.

