Do you want subtraction flash cards that already have the answers on the back? If yes, these flash cards are what you are looking for. The flash cards include subtraction flash cards for differences within 20. The answers can be printed on the back of the flash cards.
Directions: Print pages 2-43 double sided in order to have the answer printed on the back of the flash cards. It is suggested that you print the flash cards on colored paper or cardstock so the answers don't show through the card.
Check out the addition freebie version for a sneak peek!
Addition Flash Cards Freebie