Question

complete the following addition using significant figures.
5.55555 x 10^5 μg + 5.55 x 10^5 μg =
what is the mathematical answer before putting into scientific notation and before rounding using significant figures?
5.55555 x 10^5 μg
+ 5.55 x 10^5 μg
11.10555 x 10^5 μg
11.11 x 10^5 μg
11.106 x 10^5 μg
11.105 x 10^5 μg

Explanation:

Step1: Add the coefficients

Since we are adding numbers in scientific - notation with the same exponent ($10^{5}$), we add the coefficients: $5.55555+5.55 = 11.10555$.

Step2: Keep the exponent

The exponent of $10$ remains $10^{5}$. So the result before rounding and before putting in proper scientific - notation is $11.10555\times10^{5}\ \mu g$.

Answer:

$11.10555\times10^{5}\ \mu g$