## Summary:

- Calculators are only as good as the numbers put into them.
- The calculator cannot determine how accurate each of a set of numbers is.
- The answer given on the screen must be assessed by the user for reliability.
- For addition and subtraction problems, the answer should be rounded to the same number of decimal places as the measurement with the least number of decimal places.
- When working with whole numbers, pay attention to the last significant digit that is to the left of the decimal point and round your answer to that same point.

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