title: how to show zero on the left before decimal point when using round()?
body: <p>I used <code>round()</code> function to show the file size in from byte to MB.</p>
  
  <p>The data was like the following-</p>
  
  <pre><code>file_size
  ----------
  2463
  </code></pre>
  
  <p>I used this to convert-</p>
  
  <pre><code>round(document.file_size / (1024*1024), 3) file_size
  </code></pre>
  
  <p>Now the data is showing like this-</p>
  
  <pre><code>file_size
  ----------
  .002
  </code></pre>
  
  <p>But, what I want is like this-</p>
  
  <pre><code>file_size
  ----------
  0.002
  </code></pre>
  
  <p>Just the left most zero. How can I have this?</p>