Okay, we are given 3347 and 1230. Let's add them up step by step.

Step 1: We'll start by adding the digits 7 & 0 in column 1 and get 7.

Step 2: We'll start by adding the digits 4 & 3 in column 2 and get 7.

Step 3: We'll start by adding the digits 3 & 2 in column 3 and get 5.

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

So, 3347 + 1230 = 4577.

