Expansion: For older or particularly adept students, this could be a mental math game. Students could be asked to flip over cards from a tens pile and a ones pile to allow for double digit numbers.
ENL: Increased repetition of mathematical phrasing will give them practice with the vocaularly. Students could be required to say the entire percentage phrase, for example "50% of 10 is 5," in order to earn their card.
Practice percentages in this competitive card game! Race to calculate the answer as cards are flipped over. For each correct answer you give, you'll earn a card. Whoever earns the most cards, wins!