<div class="btn-toolbar" role="toolbar">
    <div class="btn-group">
      <button class="btn btn-default">1</button>
      <button class="btn btn-default">2</button>
      <button class="btn btn-default">3</button>
      <button class="btn btn-default">4</button>
    </div>
    <div class="btn-group">
      <button class="btn btn-default">5</button>
      <button class="btn btn-default">6</button>
      <button class="btn btn-default">7</button>
    </div>
    <div class="btn-group">
      <button class="btn btn-default">8</button>
      <button class="btn btn-default">9</button>
    </div>
  </div>