6,437,875
+ 3,475,259
--------------
It will be necessary to carry in this problem. The sum in the one's column
is 14 and so a one will be carried to the ten's column. The sum in the tens
column (including the one that we carried) will be 13 and so a one will be
carried to the hundred's column. The sum in the hundred's column (including
the one that we carried) will be 11 and so a one will be carried to the
thousand's column. The sum in the thousand's column (including the one that
we carried) will be 13 and so a one will be carried to the ten-thousand's
column. The sum in the ten-thousand's column will be eleven and so a one
will be carried to the hundred-thousand's column.
The sum in the hundred-thousand's column (including the one that we
carried) will be 9 and so we don't carry anything to the million's column.
The sum in the million's column will be 9. Here's the problem all worked
out:
6,437,875
+ 3,475,259
--------------
9,913,134
Now you will try a few of these yourself.