For this activity, organise the class 5 teams. Display the first event by clicking the button. All the students should copy this information into their worksheet. The first team can play for up to 10 points depending on their confidence. They have to not only identify the mistake in the account, but correct it. If they do so successfully, they gain the amount of points they played for. If they fail, they lose the same amount of points. Proceed to the second event, for the second team, and continue this format until all the slips are used. The winning team is the team with the most points.