Start with this example
Month,Sales Jan,1200 Feb,950 Mar,1450
Give your assistant a clear brief
Use a compatible tool you already have, or choose a reviewed guide below. This is a suggested learning exercise, not proof that a specific installation has been tested.
Create a workbook from this CSV. Keep the source data on one sheet and add a separate summary with a formula for total sales. Do not type the total as a fixed value. Show how to check the formula. Month,Sales Jan,1200 Feb,950 Mar,1450
Check the result
The total is 3,600. Open the workbook, inspect the formula and change January to 1,300. The total should become 3,700. A workbook that only displays 3,600 without a formula fails the exercise.
What to take away
A correct-looking number is not enough. A maintained workbook needs the calculation and a simple change test.
