Print double-sided on card stock for traditional flash cards.
I use these cards when a student needs extra help with a certain set of facts. I combine the addition and subtractions cards for each number (+6s and -6s.) This is especially good if a student is stuck on a certain addition/subtraction set. One thing I like to do is to have the student find the fact families, i.e 1+6 = 7; 6+1=7; 7-6=1 )