Differentiate instruction with this subtraction center! There are 20 problem cards that do not require regrouping and 20 cards that do require regrouping. Both sets match in the "look" but not the "skill level". There is a student answer sheet included and answer keys for both sets of cards.
Be sure to look at my other math products.
Just follow my store to receive notifications of new learning materials I am creating for your classroom and mine.