A whole class can play this game, and try to beat their best time. The answer to the math fact on one card is on a different card, so students are listening for the problem which leads to the answer on their card.
These are slides in PowerPoint, so you can print them as a handout, with 4 slides per page, and then cut and laminate. There are 32 cards, and all must be used, so some students may get more than one.
Choose one student to say their problem and start timing. Stop timing when that same student hears their answer.