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Sig. Fig. Calculations - Generally the more rigorous...

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Generally, the more rigorous approach for determining the precision of a calculated result is to propagate the  uncertainty in all your measured quantities through the calculation. The topic of error propagation through  calculations, however, is outside the scope of this course. Thus, we will present the simpler rules below for  determining the approximate number of significant figures in a calculated result. Addition and Subtraction Rule: With Addition and Subtraction keep only the number of decimals in the result that occur in the least  precise number. For example, Note that only the final answer is rounded. There is no rounding numbers in the intermediate steps of the  calculation. Multiplication and Division Rule: With Multiplication and Division, the final result should only have as many significant figures as the  term with the least number of significant figures.
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