Let's get this math done. We have 4456 and 20 and we're going to add them all together.

Step 1: We'll start by adding the digits 6 & 0 in column 1 and get 6.

Step 2: We'll start by adding the digits 5 & 2 in column 2 and get 7.

Step 3: We'll start by adding the digits 4 & 0 in column 3 and get 4.

Step 4: We'll start by adding the digits 4 & 0 in column 4 and get 4.

So, 4456 + 20 = 4476.

