Texas Instruments TI-73 Software Manual page 10

The examples below show the algorithms used to solve
problems for each type of operation.
Addition
Example: 34 + 27 = ?
TI-73 / TI-83 Plus Math by Hand Application
First, the values in the ones place are added, and the
partial sum is shown: 11 = 4 + 7.
Note: Instead of showing the carrying of the 1 to the
tens place above the 3, the partial sum of the values
in the ones place, 11, is shown. This helps students
who are learning the algorithm for the first time or
those who have trouble lining up their writing.
Next, the values in the tens place are added and the
partial sum is shown: 50 = 30 + 20.
In the final step, the partial sums are added and the
answer is shown: 11 + 50 = 61.
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