Show or explain how to write 8,523 in expanded form using 15 hundreds.

part c vvv

a student used 80 ten thousands in the expanded form of the number 6,807,590.
show or explain how 6 hundred thousands, 80 ten thousands, 7 thousands, 5 hundreds, and 9 tens can or cannot be used to represent 6,807,590. if it cannot be used, show how you would correct it and still use 80 ten thousands.