This document presents a new teaching tool called the Math Cube designed for primary school children. The Math Cube aims to help communicate mathematical topics like numbers and fractions in an engaging hands-on way by showing the relationship between 2D and 3D shapes. It is influenced by the Montessori teaching method. The Math Cube is a 10cm magnetic cube that can be adapted for different lessons. It is intended to provide both a teaching aid for demonstrations and group work as well as an individual learning tool to track student progress.