These strips are meant to be used as a tool for memorizing count by's as related to multiplication. There is a strip with count by's for 2-12. I use these in my classroom by laminating and cutting out a set for each student. These are placed on binder rings as we begin working on/mastering each set. Students bring them to and from school to use as homework and also to practice during classroom time. Graphic credit to Ron Leishman Digital Toonage at https://www.teacherspayteachers.com/Store/Ron-Leishman-Digital-Toonage. Thanks for looking and if you choose to purchase I hope you find this to be an effective teaching tool for your students.