Answers

2014-09-28T20:48:46+08:00
We need to multiple that
so , 3.9 × 105 = N
 
           105
       ×   3.9 --- there was 1 decimal point
       ----------
           945
          315
      -----------
        409.5 --- we need to put 1 decimal point here

The total is 409.5
1 5 1