Here we go! We're going to add 309 and 305 together.

Step 1: We'll start by adding the digits 9 & 5 in column 1 and get 14.
We'll write down the last digit 4 and carry the 1 to the next column.

Step 2: We'll start by adding the digits 0 & 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, 309 + 305 = 614.

