<p>This is my principle grammar problem. I have missed every question that has involved one of these phrases. Period. </p>
<p>According to BB:
"The dolls in the collection, all more than 200 years old. . . " is correct.</p>
<p>There's one problem I remember doing where "more than" was incorrect, however, I can't seem to find it.</p>
<p>When is "more than" used and when is "over" used?</p>
<p>Here’s what Patricia T. O’Connor has to say about it in Woe is I:</p>
<p>“You may have been told by some pedant that over doesn’t apply to numbers, only to quantities. Not so. It’s fine to use over in place of more than or in excess of: Dad’s new car gets over ten miles to the gallon.”</p>
<p>I really don’t think that they would ask a more than/over question on the SAT–that’s an old rule that nowadays isn’t considered a crime.</p>