Ready to do some math? We're starting with 3121 and 2234 and adding them up.

Step 1: We'll start by adding the digits 1 & 4 in column 1 and get 5.

Step 2: We'll start by adding the digits 2 & 3 in column 2 and get 5.

Step 3: We'll start by adding the digits 1 & 2 in column 3 and get 3.

Step 4: We'll start by adding the digits 3 & 2 in column 4 and get 5.

So, 3121 + 2234 = 5355.

