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  4. If 3.8 × 10-6 is added to 4.2 × 10-5 giving due regard to significant figures, then the result will be

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Q. If $3.8 × 10^{-6}$ is added to $4.2 × 10^{-5}$ giving due regard to significant figures, then the result will be

Physical World, Units and Measurements

Solution:

We will use the general rule of addition by making the powers same.
i.e., we add $3.8 × 10^{-6}$ and $42 × 10^{-6}$, we get
$45.8 × 10^{-6} = 4.58 × 10^{-5}$.
As least number of significant figures in given values are $2$, so we round off the result to $4.6 × 10^{-5}$.