Students will be solving 20 problems on the greatest common factor given two numbers. After solving the problems, students will cut out the boxes and glue them onto the other page according to their gcf. This is a great activity that can be given individually or in groups of 2-4. In addition, it is self-assessing in two ways: (1) students know that if they don't see their solution on the page then they need to check their answer and (2) after placing their boxes down, there is a hidden message. If they do not see the message, then they know that they made a mistake. This activity can take 1-2 days (1 day if you are on block schedule and 2 days if you are not on block schedule).

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