Okay, we are tasked with adding 311 and 487. Let's begin!

Step 1: We'll start by adding the digits 1 & 7 in column 1 and get 8.

Step 2: We'll start by adding the digits 1 & 8 in column 2 and get 9.

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

So, 311 + 487 = 798.

