For many teachers, the Venn Diagram has become an indispensable instructional tool. A few years ago I discovered (for myself) how to use the Venn to teach greatest common factor and least common multiple.
A few years later I created a few Venn Diagrams using Adobe Flash so I could teach GCF & LCM on my SMARTBoard. Just click on the link below and you can use them too. A SMART Notebook gallery collection file will download to your desktop. Open the file and the Venn Diagrams are automatically added to your My Content folder.