Subtracting Mixed Numbers with Ungrouping

Don't let ungrouping scare you!  Ungrouping is simply changing the form of the same number.  It is similar to getting change for a $10 bill.  If you owe someone $4, but all you have is a $10 bill, you will need to break your bill by changing the form to a $5 and 5 $1 bills.  You still have $10, it's just in a different form.  Now you can give the person you owe $4.  Click on the link below to see an example.

http://www.showme.com/sh/?h=tnDGS9o