This set includes 10 showdown cards (practicing metric measurements) for you to print. If you wish you may print the covers on the back side of the cards which is very useful in case the cards get mixed up. Each group is labeled so you will know which card belongs to which group.
Showdowns are VERY simple, yet very effective. I always put my students in groups of 4 with white boards and markers.
Groups get about 10 showdown cards with specific problems from the content we are learning. The cards are placed down in the middle of the desks. Students need to decide who the first leader will be. The leader turns over the top card and reads the problem. Everyone in the group, including the leader, writes the problem on their white board. When everyone has the problem written the leader says, "Go," and everyone begins working on the problem. Once finished each student turns their white board face down. When the leader notices that everyone in the group has their white board down they say, "Showdown!" Everyone flips their board over and shares their answer.
This is the most important part. If everyone gets the same answer they can assume it is correct. If not - groups need to discuss to see if someone did something wrong and HELP that student see what they did wrong. I always walk around to make sure this is happening. The goal is to work together and make sure everyone in the group understands.
Students rotate who is the leader until they've gone through all of the cards.