math
posted by Sue .
Write the number in expanded form.
684

Check the clear instructions in this site to learn how to write numbers in expanded form.
http://www.aaamath.com/plc31dplacevalueadd.html
We'll be glad to check your answer. 
684 in expanded form is
6x100+8x10+4x1 
Yes  or it could be stated:
600 + 80 + 4