Assess students' ability to decompose whole numbers 6–20 into two addends (number bonds). The quiz will test identifying all pairs (ordered and unordered) that sum to a target number, finding a missing addend, representing decompositions with simple number-bond diagrams or equations, and using strategies (counting on, complements of ten) to analyze and justify solutions. Tasks require enumeration, comparison of different decompositions, and short explanations appropriate for Pre-K–Grade 2 at a medium difficulty level.