Question 728649
<pre>
{{{(8.1*10^12)/(5.4*10^9)}}} 

Separate the powers of 10 from the other part:

{{{8.1/5.4}}}{{{""*""}}}{{{10^12/10^9}}}

Divide the first part, subtract exponents of 10
on the second part:

1.5×10<sup>3</sup>

Edwin</pre>