Boom Boxes are great for #fluency! Put the flashcards you want students to practice into a box and add about five flashcards that say "BOOM!". The students take turns pulling cards and reading them. If they can read the card then they keep it. If they cannot, then they put it back. If they pull a "BOOM!" card then they must put all their cards back into the box. It's a neverending, but fun game!