Alright, let's solve this problem step by step. We have 6120 and 1053 and we're adding them 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 2 & 5 in column 2 and get 7.

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

Step 4: We'll start by adding the digits 6 & 1 in column 4 and get 7.

So, 6120 + 1053 = 7173.

