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 (+7s and -7s.) 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+7 = 8; 7+1=8; 8-7=1. (8-1 is not represented in this set but the student may include it as well.)