We've got two numbers: 4324320229 and 2821818912. Let's find their sum.

Step 1: We'll start by adding the digits 9 & 2 in column 1 and get 11.
We'll write down the last digit 1 and carry the 1 to the next column.

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

Step 3: We'll start by adding the digits 2 & 9 in column 3 and get 11.
We'll write down the last digit 1 and carry the 1 to the next column.

Step 4: We'll start by adding the digits 0 & 8 in column 4 and get 9.

Step 5: We'll start by adding the digits 2 & 1 in column 5 and get 3.

Step 6: We'll start by adding the digits 3 & 8 in column 6 and get 11.
We'll write down the last digit 1 and carry the 1 to the next column.

Step 7: We'll start by adding the digits 4 & 1 in column 7 and get 6.

Step 8: We'll start by adding the digits 2 & 2 in column 8 and get 4.

Step 9: We'll start by adding the digits 3 & 8 in column 9 and get 11.
We'll write down the last digit 1 and carry the 1 to the next column.

Step 10: We'll start by adding the digits 4 & 2 in column 10 and get 7.

So, 4324320229 + 2821818912 = 7146139141.

