Let's get this math done. We have 7854841229 and 6256523888 and we're going to add them all together.

Step 1: We'll start by adding the digits 9 & 8 in column 1 and get 17.
We'll write down the last digit 7 and carry the 1 to the next column.

Step 2: We'll start by adding the digits 2 & 8 in column 2 and get 11.
We'll write down the last digit 1 and carry the 1 to the next column.

Step 3: We'll start by adding the digits 2 & 8 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 1 & 3 in column 4 and get 5.

Step 5: We'll start by adding the digits 4 & 2 in column 5 and get 6.

Step 6: We'll start by adding the digits 8 & 5 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 4 & 6 in column 7 and get 11.
We'll write down the last digit 1 and carry the 1 to the next column.

Step 8: We'll start by adding the digits 5 & 5 in column 8 and get 11.
We'll write down the last digit 1 and carry the 1 to the next column.

Step 9: We'll start by adding the digits 8 & 2 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 7 & 6 in column 10 and get 14.
We'll write down the last digit 4 and carry the 1 to the next column.

So, 7854841229 + 6256523888 = 14111365117.

