title: Javascript: Round by 100
body: <p>I'm trying to round a number the 100.</p>
  
  <p>Example:</p>
  
  <pre><code>1340 should become 1400
  1301 should become 1400
  </code></pre>
  
  <p>and</p>
  
  <pre><code>298 should become 300
  200 should stay   200
  </code></pre>
  
  <p>I know about <code>Math.round</code> but it doesn't round to the 100.</p>
  
  <p>How can I do that ?</p>