5784658365+63675748475=

5784658365+63675748475= 69460406840 what you do is you put one colum on top of the other and then you add

 5784658365

+63675748475

We start at the right.  5+5=10.  Mark that column 0,  then carry the 1 a space to the left.

6+7+1=14.  Mark the column 4,  then carry the one to the left.

3+4+1=8.  There are no numbers to carry, so mark that column 8.

8+8=16.  Mark the column 6, and carry the one to the left.

5+4+1=10.  Mark the column 0,  then carry the 1 to the left.

6+7+1=14.  Mark the column 4,  then carry the one to the left.

4+5+1=10.  Mark the column 0,  then carry the one to the left.

8+7+1=16.  Mark the column 6,  and carry the one to the left.

7+6+1=14.  Mark the column 4,  then carry the one to the left.

5+3+1=9.  Mark the column 9,  there are no ones to carry.

There is one more 6 column.  Add it to the beginning of the answer.

6,946,040,680 is the answer,  and my work here is done