The two papers on IconCounting address preschool, primary school and special needs education. The paper ‘As PerNumbers, Fractions are Operators, not Numbers’ addresses middle school. The paper ‘Preschool, Middle school and High school Calculus’ addresses primary, middle and high school. The papers ‘From Essence to Existence in Mathematics Education’ and ‘From Essence to Existence in Math teacher Education’ address teacher education. The paper ‘From Essence to Existence in Geometry Education’ addresses primary school.