Help Goofus find his mistakes with subtraction with regrouping. This will only be beneficial if you have taught your students to use expanded form when subtracting. There is value in having the students decompose the numbers into hundreds, tens, and ones so they can see what they are actually subtracting. This includes 7 activity pages. On each page Goofus has solved a subtraction problem with regrouping incorrectly. It's up to your students to find his mistakes and show him how to do it correctly. This generates higher level thinking when students have to analyze the errors made by others. Great for homework, early finishers, exit tickets, center activities and much more.