Math, Decimals, Adding and Subtracting Decimals, Authentic Problems, Harkness Discussion, Critical Thinking, Problem Solving, Rubric, Assessment Criteria, Data Collection, Decimal Operations Activity, Decimal Shopping Activity, Real-World Decimals, Decimal Word Problems

Decimal Discussion Adventure: The $20 Shopping Showdown! Engage your 4th-7th grade students in meaningful mathematical discourse with this exciting Decimal Discussion Adventure! This ready-to-use resource transforms decimal addition and subtraction into a fun, real-world "shopping spree" challenge that's perfect for classical, Harkness-style, or discussion-based classrooms.
Students work in groups with exactly $20 to spend at the ultimate school store. The goal? Get as close as possible to $20 without going over!
This complete package includes everything you need for a successful student-led discussion:

• Clear physical set-up instructions (desks in a giant oval or circle)
• Established discussion norms for productive conversations
• The engaging $20 Shopping Showdown prompt with item list
• 5 guided group discussion questions to deepen understanding and encourage justification
• Ready-to-use discussion grading rubric (Mastery to Remediation levels)
• Participation tally and data tracking sheet for easy assessment

Ideal for building number sense, promoting collaborative problem-solving, and fostering rich math talk. No prep required—just print and facilitate a lively, authentic decimal operations experience that students will love!

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