A year-long number strand inquiry unit for mathematics. Different areas of the number strand are covered systematically and sequentially in this How the World Works (IB PYP) unit plan to help learners build solid knowledge, strategies and skills. Easily adapted to suit your own class/school, it includes: transdisciplinary theme, central idea, lines of inquiry, key concepts and questionsapproaches to learning (ATLs) and learner profile focusagency and action ideasassessment - before views, forma