Challenge your students with maths problems that don't have a single right answer. These Open Ended Math and Fermi Questions give Grades 2–6 students real-world estimation challenges that build critical thinking, problem-solving, and reasoning skills. Includes 20 investigation worksheets, 20 task cards, teacher slides, and reflection activities. Perfect for math extension, enrichment, or problem-solving lessons. Students break down big questions into manageable steps, make estimations, and just