What about if you have more numbers to add in a stack?
44
81
33
22
+91
-------
You start adding in the usual way: you add the ones column:
1
44
81
33
22
+91
-------
1
The sum for the ones column in the example is 11 and so you must carry a one
to the tens column.
Next you add up the tens column:
1
44
81
33
22
+91
-------
271
The final answer to this problem is 271. If you had numbers larger than one
hundred you would simply proceed to the hundreds column and continue adding
as usual.
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