Here is a quick tip using a simple tool, the 100 grid. My grid size is one full page and then part of a second page cut and taped in the back. (I laminated.) It created an oversized grid, which I liked. There are tips for logistics, assessment, initial EXPLORATION (which is key), and scaffolding ideas. Difficult teen recognition is addressed and more importantly, it offers opportunities for students to explore patterns on the grid, which develops natural mathematical thinking. Each student needs a grid and transparent marker. This can be done with small group interventions or whole group. Go mathematicians!