ABSTRACT
Number is a complex and multifaceted concept. A well-developed understanding of number includes a grasp not only of counting and numeral recognition but also of a complex system of more-and-less relationships, the role of special numbers such as five and ten, connections between numbers and real quantities and measures in the environment, and much more. The activities at the levels are primarily the same but the number ranges vary. Students are getting more comfortable with putting numbers together and breaking them apart. Students can also listen to videos about this at the workstation. In the primary grades, subitizing and composing and decomposing numbers are essential ongoing activities. They both have learning trajectories that educators have to consider when designing workstation activities. Students who are proficient in both these skills have very little trouble moving into adding and subtracting because they have been working with, seeing and playing around with numbers in numerous ways.
