I have just completed a new subtraction game called Look and Learn with a butterfly theme. Students love to play this game at centers. It gives them the opportunity to practice new subtraction skills and work with a classroom theme at the same time.
This game can be found at my TeachersPayTeachers store.
To use, print the grid at 200%, and print the flashcards regular size, laminate for durability. Place the flashcards anywhere on the grid that you like. Students use the regular page size grid to record their answers to the problems. For instance, the first flashcard would be recorded as 5-1=4. Since the placement of flashcards is random, this center is different every time you use it.