Question 1055810
<pre><b>
 4503599627400000 

Put a decimal between the first digit 4 and the 5 next to it:

 4.503599627400000

Now count how many digits there are after the decimal.
I count 15.  Remember that number, 15.

 Drop off all the trailing zeros at the end:

 4.5035996274

Remembering that number 15, put on ×10<sup>15</sup>  

 4.5035996274×10<sup>15</sup>      <-- final answer

Edwin</pre>