This is fun, easy to grade, partner activity for reviewing mean, median, mode, and range. It takes my students roughly 20 minutes to complete and is ideal for class work or a sub plans.
I encourage students to work in pairs. They work each problem box together, then circle their answer. After completing all 25 boxes, the write their answers at the bottom of the sheet. Then calculate the mean, median, mode, and range of their answers. All of the answer come out evenly (ie. there are no decimals).
I give the students extra credit if they get the correct answers for the final mean, median, mode, and range on their FIRST or SECOND try. If they have the wrong answers, then I will tell them "you have three correct and one wrong" or "you have two correct and two wrong." Then they work together to find their mistake.