Problem Solving (PS) | Which of the following is the closest to 11*1020–9*1010?

We have been asked to find the value of the expression\(11*10^{20}–9*10^{10}\)

\(11*10^{20}–9*10^{10}\) =\(11*10^{10}*10^{10} – 9*10^{10}\) =\(10^{10}(11*10^{10} – 9)\)

Since we need an approximate value and the overall expression has extremely large numbers,
we can assume both 11 and 9 to be equal to 10

The expression now becomes\(10^{10}(10*10^{10} – 10)\) =\(10^{11}(10^{10} – 1)\) =\(10^{11}(10^{10}))\)

Since a difference of 1 does not influence the value of the
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