Sure thing! We've got 5558990030 and 3391379991 and we're gonna add them together.

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

Step 2: We'll start by adding the digits 3 & 9 in column 2 and get 12.
We'll write down the last digit 2 and carry the 1 to the next column.

Step 3: We'll start by adding the digits 0 & 9 in column 3 and get 10.
We'll write down the last digit 0 and carry the 1 to the next column.

Step 4: We'll start by adding the digits 0 & 9 in column 4 and get 10.
We'll write down the last digit 0 and carry the 1 to the next column.

Step 5: We'll start by adding the digits 9 & 7 in column 5 and get 17.
We'll write down the last digit 7 and carry the 1 to the next column.

Step 6: We'll start by adding the digits 9 & 3 in column 6 and get 13.
We'll write down the last digit 3 and carry the 1 to the next column.

Step 7: We'll start by adding the digits 8 & 1 in column 7 and get 10.
We'll write down the last digit 0 and carry the 1 to the next column.

Step 8: We'll start by adding the digits 5 & 9 in column 8 and get 15.
We'll write down the last digit 5 and carry the 1 to the next column.

Step 9: We'll start by adding the digits 5 & 3 in column 9 and get 9.

Step 10: We'll start by adding the digits 5 & 3 in column 10 and get 8.

So, 5558990030 + 3391379991 = 8950370021.

