In order to be able to write a number in expanded form, you must first understand how to find the value of a number. Remember the value represents the worth of a number based on the place that it is in. Expanded form is a way to write the value of each individual digit.
395,980
3 = 300,000
9 = 90,000
5 = 5,000
9 = 900
8 = 80
0 = 0