Q:

Jquery - targetting with a combination of variable and classname

I'm sure this is an easy one but I've not had to write this syntax before and i cant find an answer online! 
I have a various graph sliders within a html page - each have the below code - 
   <div class="sliderDbWk">
        <div class="spanner">
             <div class="number">
                <span class="timer"> </span>
                    <Span class="timerPc">%</Span>
             </div>
        </div>
   </div>

Each parent class is different (ie sliderDbMnth, sliderDbCal), i pass in to a function the sliders parent class and want to target the child .number div within this - so the parent class is stored as a variable - I'm not sure how to combine a variable and a class name in a function - i've tried below - but it doesn't work! 
Any ideas? 
 $(sliderSelect).children(' .number').css('margin-left',0);

A:

It should be .find('.number'), not children('.number') - as you start your search from '.sliderSomething' element, and <div class="number"> is its grandchild.  Quoting the doc:

The .children() method differs from .find() in that .children() only
  travels a single level down the DOM tree while .find() can traverse
  down multiple levels to select descendant elements (grandchildren,
  etc.)  as well.