EL 1 - Where do the chemical elements come from?, EL 2 - How do we know so much about outer space?, EL 3 - Electrons, where would we be without them?...
5 Introducing Order Of Operations (old 6), 5 Variables, Coefficients, And Algebraic Expressions (old 7), 5 Solving One And Two Step Equations With Models, Résolution d'équations à deux étapes à l'aide de modèles (old 7-8)...