Evaluate
\frac{1}{250000000000000000000}=4 \cdot 10^{-21}
Factor
\frac{1}{2 ^ {19} \cdot 5 ^ {21}} = 4 \times 10^{-21}
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\frac{2}{5\times 10^{20}}
Cancel out 10^{99} in both numerator and denominator.
\frac{2}{5\times 100000000000000000000}
Calculate 10 to the power of 20 and get 100000000000000000000.
\frac{2}{500000000000000000000}
Multiply 5 and 100000000000000000000 to get 500000000000000000000.
\frac{1}{250000000000000000000}
Reduce the fraction \frac{2}{500000000000000000000} to lowest terms by extracting and canceling out 2.
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