title: JavaScript round error ToFixed, NumberPrototypeRound
body: <p>I'm tried many things but I still have a problem,
  example: 4.3725 * 350 = 1530.38 but my result is 1530.37 ;/</p>
  
  <p>I tried this: </p>
  
  <pre><code>Number.prototype.round = function(places) {
    return +(Math.round(this + "e+" + places)  + "e-" + places);
  }
  </code></pre>
  
  <p>and toFixed.</p>