Alright, let's solve this problem step by step. We have 3012 and 3154 and we're adding them together.

Step 1: We'll start by adding the digits 2 & 4 in column 1 and get 6.

Step 2: We'll start by adding the digits 1 & 5 in column 2 and get 6.

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

Step 4: We'll start by adding the digits 3 & 3 in column 4 and get 6.

So, 3012 + 3154 = 6166.

