A Tarsia Jigsaw activity on finding averages (mean, median, mode) and the range. These type of activities can be used to consolidate understanding of a given topic, and foster positive group work and co-operative learning. By making adjustments such as removing answers and making deliberate mistakes, they can be made even more challenging and engaging to the students. To download the latest version of the wonderful free software to open this resource (and create your own), click on the web-link. If you have any comments, or spot any (non deliberate!) mistakes, please share them below.