No problem, let's work through this together. We're starting with 138100374 and 6343905989 and adding them all up.

Step 1: We'll start by adding the digits 4 & 9 in column 1 and get 13.
We'll write down the last digit 3 and carry the 1 to the next column.

Step 2: We'll start by adding the digits 7 & 8 in column 2 and get 16.
We'll write down the last digit 6 and carry the 1 to the next column.

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

Step 4: We'll start by adding the digits 0 & 5 in column 4 and get 6.

Step 5: We'll start by adding the digits 0 & 0 in column 5 and get 0.

Step 6: We'll start by adding the digits 1 & 9 in column 6 and get 10.
We'll write down the last digit 0 and carry the 1 to the next column.

Step 7: We'll start by adding the digits 8 & 3 in column 7 and get 12.
We'll write down the last digit 2 and carry the 1 to the next column.

Step 8: We'll start by adding the digits 3 & 4 in column 8 and get 8.

Step 9: We'll start by adding the digits 1 & 3 in column 9 and get 4.

Step 10: We'll start by adding the digits 0 & 6 in column 10 and get 6.

So, 138100374 + 6343905989 = 6482006363.

