This introductory chapter explores the relationship between numbers and their spatial representations through squares and square roots. Students learn to identify perfect squares and calculate their roots, while also developing strategies to estimate the roots of non-perfect squares. The curriculum introduces the Pythagorean Theorem as a practical application for finding missing side lengths in right-angled triangles. To wrap up the unit, students investigate the surface area of complex 3D composite objects, helping them visualize and calculate area in a three-dimensional context