Okay, we are tasked with adding 4124 and 3120. Let's begin!

Step 1: We'll start by adding the digits 4 & 0 in column 1 and get 4.

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

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

Step 4: We'll start by adding the digits 4 & 3 in column 4 and get 7.

So, 4124 + 3120 = 7244.

