1. The YuMi Deadly Maths teaching model uses a planning cycle of Reality, Abstraction, Reflection, and Mathematics to introduce math concepts.
2. It begins with relating concepts to students' reality, then uses abstraction to identify variables and order/compare objects. This leads students to understand only one factor can be compared at a time.
3. Mathematics is then introduced using numbers, estimation, rounding, and finding relationships between concepts. Reflection involves reversing relationships before linking to new ideas and returning to reality.