This new resource unit of more than 80 minilessons for kindergarten makes use of the 5- and 10-bead MathracksTM and provides the research and a developmental progression for using the rekenrek. Like the unit Rhoda Red and Loretta Leghorn, this unit builds on children’s innate ability to subitize small amounts (1, 2, and 3) and uses it to develop the five-structure (to see, for example, 5 inside of 7 and 5 inside of 8). Used throughout the year, it supports children to automatize the basic addition and subtraction facts to ten. Relationships between the facts are also explored and developed using compensation and associativity to support children to understand and come to see how and why many facts are equivalent, for example: 3+7=4+6=5+5.