title: Rounding to nearest 100
body: <p>First number needs to be rounded to nearest second number. There are many ways of doing this, but whats the best and shortest algorithm? Anyone up for a challenge :-) </p>
  
  <p>1244->1200 <br>
  1254->1300<br>
  123->100<br>
  178->200<br>
  1576->1600<br>
  1449->1400<br>
  123456->123500<br>
  654321->654300<br>
  23->00<br>
  83->100<br></p>