I use this produce with Module 3 of Eureka Math, Grade 2. It is a reference tool for students to use to see how numbers can be written AND how numbers can be modeled using the various methods mentioned in Eureka Math. I printed in color on cardstock and have them save it in their Red Reference Folder. They pull it out constantly to remind themselves. It can also be printed on poster paper for a year-round reference tool in the classroom!