There are two PRIME Coursebooks for each level. Each chapter treats a mathematical concept in depth, with a series of tightly scaffolded lessons to gradually build studentsâ understandings. Each lesson starts with an explicit, teacher-led activity called Letâs Learn that models examples of mathematical thinking and problem solving. This is followed by some âguidedâ activities to allow students to apply their understandings in Letâs Do. At the end of lessons there are some Letâs Practice activities so students are able to demonstrate their understandings and teachers are able to do immediate formative assessment. Many of the topics in PRIME go beyond those taught in the Australian curriculum at the same year level. A curriculum alignment is available.