Shuffle the deck and place it face down in the center to be the draw pile. Get pencil and paper to keep track of the answer if necessary.
Be the person who flips over the card that gets you to your number goal.
Decide on your number goal and if you need to reach the exact number or just get to it. Popular options are 0, 25, 50, and 100. Take turns flipping over a card. Add or subtract that number to the previous total. The person whose card gets to the target number wins.