This assessment was created for students to show case their knowledge on how to decompose or break apart numbers with two addends. Students will decompose numbers 5-8 by using counters and number bonds. This assessment can be used for MOY kindergarten students or BOY first grade students. Modifications can be applied for advanced students to decompose whole numbers into three or more addends. This assessment has three parts: Fluency (part 1), Conceptual Development (part 2), and Application (part 3). It also includes an extra credit question (performance task).