π§ Montessori Sensorial Material β Binomial and Trinomial Cube Observation & Assessment Checklist Form Introducing algebraic concepts through hands-on discovery. The Montessori Observation and Assessment Checklist for the Binomial and Trinomial Cube is a carefully designed tool to help educators observe, document, and assess a childβs development of visual discrimination, logical thinking, problem-solving, and indirect algebraic understanding through concrete, self-correcting work. This checklis