What rules are foolowed while rounding off a calculated result to the required number of significant figures?
ICSE Class 9 Physics Chapter Measurements and Experimentation
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Conditions for rounding off the result are :-
(i) If the digit to be dropped is less than 5, the digit immediately preceding it remains unchanged.
Example: If the result 4.632 m is to be rounded off to two significant figures, it will be 4.6m(the digits 2 and 3 have been dropped since they are less than 5).
(ii) If the digit to be dropped is more than 5, the digit immediately preceding it is increased by 1.
Example: Result 7.457 m, when rounded off to two significant figures will be 7.5m since on dropping the last digit 7, it becomes 7.46 and then on dropping the digit 6, it becomes 7.5m.
(i) If the digit to be dropped is less than 5, the digit immediately preceding it remains unchanged.
Example: If the result 4.632 m is to be rounded off to two significant figures, it will be 4.6m(the digits 2 and 3 have been dropped since they are less than 5).
(ii) If the digit to be dropped is more than 5, the digit immediately preceding it is increased by 1.
Example: Result 7.457 m, when rounded off to two significant figures will be 7.5m since on dropping the last digit 7, it becomes 7.46 and then on dropping the digit 6, it becomes 7.5m.
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