OK, let's do this. We've got 2743340011 and 7110311915 and we're adding them all together.

Step 1: We'll start by adding the digits 1 & 5 in column 1 and get 6.

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

Step 3: We'll start by adding the digits 0 & 9 in column 3 and get 9.

Step 4: We'll start by adding the digits 0 & 1 in column 4 and get 1.

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

Step 6: We'll start by adding the digits 3 & 3 in column 6 and get 6.

Step 7: We'll start by adding the digits 3 & 0 in column 7 and get 3.

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

Step 9: We'll start by adding the digits 7 & 1 in column 9 and get 8.

Step 10: We'll start by adding the digits 2 & 7 in column 10 and get 9.

So, 2743340011 + 7110311915 = 9853651926.

