Okay, we are tasked with adding 6373 and 1120. Let's begin!

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

Step 2: We'll start by adding the digits 7 & 2 in column 2 and get 9.

Step 3: We'll start by adding the digits 3 & 1 in column 3 and get 4.

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

So, 6373 + 1120 = 7493.

