So how does this work? The 6 is of course in the tens column.

            When we do the first division this is like asking:
            how many times will 40 go into 60?

            This is obviously once with 20 remaining which we add to the next column:

            

            Now we are in the units so do 4 into 24 as expected:

           

             We don't have to know this and we don't do division this way but it may help!