Here are the sample grid sizes you can use for bootstrap:
Article body
<div class="row"> <div class="articletext"> <p>Article text goes here</p> </div> </div>
2 columns inside an article body
<div class="row"> <div class="articletext"> <div class="row"> <div class="col-md-6">COL1TEXT</div> <div class="col-md-6">COL2TEXT</div> </div> </div> </div>
COL1TEXT
COL2TEXT
3 columns inside an article body
<div class="row"> <div class="articletext"> <div class="row"> <div class="col-md-4">COL1TEXT</div> <div class="col-md-4">COL2TEXT</div> <div class="col-md-4">COL3TEXT</div> </div> </div> </div>
COL1TEXT
COL2TEXT
COL3TEXT
Full page width
<div class="row"> <div class="col-md-12"> Full page content </div> </div>
Two columns outside of article body
<div class="row"> <div class="col-md-8 col-md-offset-2"> <div class="row"> <div class="col-md-6"> COL1TEXT </div> <div class="col-md-6"> COL2TEXT </div> </div> </div> </div>
COL1TEXT
COL2TEXT