Let's break this down. We're going to add 6136 and 1003 together.

Step 1: We'll start by adding the digits 6 & 3 in column 1 and get 9.

Step 2: We'll start by adding the digits 3 & 0 in column 2 and get 3.

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, 6136 + 1003 = 7139.

