This is not a new lesson and I'm sure it is one you've used before, but it is a valuable lesson when it comes to strengthening multiplication facts and the notion of factors, factor pairs and the greatest common factor. Later the venn diagrams can be used to compare a set of multiples for each number and the least common multiple too. Research shows we should combine two opposing concepts at the same time, so you might want to alternate multiple diagrams and factor diagrams in the same packet. Today our fact coaching teams will use this assignment to build skill (I simply made multiple copies and wrote some of the most difficult numbers under 100 for students to grasp with regard to factors.). Feel free to use as well if it will be helpful.