Wed April 09, 2014 By: Krunal Badlani

why is always the no. with the lowest nos. of significant figures chosen in addition or subtraction for rounding off the answer? 

Expert Reply
Thu April 10, 2014
Dear Krunalbadlani

When combining measurements with different degrees of accuracy and precision, the accuracy of the final answer can be no greater than the least accurate measurement. This principle can be translated into a simple rule for addition and subtraction: When measurements are added or subtracted, the answer can contain no more decimal places than the least accurate measurement.


Topperlearning Team.
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