expanded form of big numbers

Here is an efficient way to write the expanded form of a number.  Instead of writing the expanded form horizontally, write it vertically and line up the place values.  There is less chance of errors with the zeros and value of the numbers.

 

2,383,490

2,000,000 +

  300,000 +

    80, 000 +

       3,000 +

           400 +

              90