This download includes printable black and white subtraction flash cards with facts 0-0 through 20-20 (-0,-1,-2,-3,-4,-5,-6,-7,-8,-9,-10,-11,-12,-13,-14,-15,-16,-17,-18,-19, and -20). There are counting dots on each of the numbers. Included are three different versions of the flash cards. Choose the horizontal flash cards, vertical flash cards, or the flash cards with related facts all on one page! Print on cardstock or construction paper for extra durability. Answer keys are included so t