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Convert each of the following from scientific notation to decimal notation (without any exponents).

Do not use commas in your answers.

The earth’s diameter: about $1.27\times 10^{7}$ meters.

As of 2013, known digits of $\pi\text{:}$ $1.21\times10^{13}\text{.}$

Solution

To convert this number to decimal notation we will move the decimal point after the digit $1$ seven places to the right, including zeros where necessary. The earth’s diameter is:
$1.27\times 10^{7}\text{ meters} = 1\overbrace{2{,}700{,}000}^{7\text{ places}}\text{ meters} \text{.}$

As of 2013 there are
$1.21\times10^{13} = 1\overbrace{2{,}100{,}000{,}000{,}000}^{13\text{ places}}$
known digits of $\pi\text{.}$

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