We've got two numbers: 311 and 303. Let's find their sum.

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

Step 2: We'll start by adding the digits 1 & 0 in column 2 and get 1.

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

So, 311 + 303 = 614.

