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Further discussion on Significant figures 

As the factor 3.64 × 10^{⁴}, the least accurate in the above calculation has three significant figures, the answer should be written to three significant figures only. The other figures are insignificant and should be deleted. While deleting the figures, the last significant figure to be retained is rounded off for which the following rules are followed.
43.75 is rounded off as 43.8
3.42 4.10 Correct answer: 75.5 m 8.13 m In case (i) the number 72.1 has the smallest decimal places, thus the answer is rounded off to the same position which is then 75.5 m. in case (ii), the number 4.10 has the smallest number of decimal places and hence, the answer is rounded off to the same decimal positions which is then 8.13 m. 



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