No problem, let's work through this together. We're starting with 142 and 624 and adding them all up.

Step 1: We'll start by adding the digits 2 & 4 in column 1 and get 6.

Step 2: We'll start by adding the digits 4 & 2 in column 2 and get 6.

Step 3: We'll start by adding the digits 1 & 6 in column 3 and get 7.

So, 142 + 624 = 766.

