We've got two numbers: 1868969790 and 9234476640. Let's find their sum.

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

Step 2: We'll start by adding the digits 9 & 4 in column 2 and get 13.
We'll write down the last digit 3 and carry the 1 to the next column.

Step 3: We'll start by adding the digits 7 & 6 in column 3 and get 14.
We'll write down the last digit 4 and carry the 1 to the next column.

Step 4: We'll start by adding the digits 9 & 6 in column 4 and get 16.
We'll write down the last digit 6 and carry the 1 to the next column.

Step 5: We'll start by adding the digits 6 & 7 in column 5 and get 14.
We'll write down the last digit 4 and carry the 1 to the next column.

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

Step 7: We'll start by adding the digits 8 & 4 in column 7 and get 13.
We'll write down the last digit 3 and carry the 1 to the next column.

Step 8: We'll start by adding the digits 6 & 3 in column 8 and get 10.
We'll write down the last digit 0 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 1 & 9 in column 10 and get 11.
We'll write down the last digit 1 and carry the 1 to the next column.

So, 1868969790 + 9234476640 = 11103446430.

