title: Javascript Math Round
body: <p>im getting a little issue here. Im trying to do a simple math, but im forgetting something.</p>
  
  <p>Here's what:</p>
  
  <pre><code>var valorOriginal = 9.90;
  
  var discount = Math.round(valorOriginal*12*0.25);
  var anual = Math.round(valorOriginal*12)-discount;
  
  alert(anual);
  </code></pre>
  
  <p>If you do this math on calc, it will give you <code>89.1</code>, but im just getting 89 rounded. Whats wrong?</p>
  
  <p>Thanks!</p>