999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999/10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 as a decimal

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as a decimal as a fraction as a percent

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What is 999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999/10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 as a decimal?

To write 999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999/10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 as a decimal you have to divide numerator by the denominator of the fraction.
We divide now 999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999 by 10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 what we write down as 999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999/10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 and we get 1.0E-31

And finally we have:
999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999/10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 as a decimal equals 1.0E-31