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Q. Taking into account of the significant figures, what is the value of $9.99 \,m - 0.0099 \,m$ ?

NEETNEET 2020Physical World, Units and Measurements

Solution:

$9.99 m -0.0099 m =9.9801 m$
But our answer, Should have same no. of significant figures, as the least accurate number.
$\therefore $ Ans $=9.98 m$.