As we strive to create a seamless and meaningful mathematics experience for our students, it is important for us to have a strong understanding of what conceptual knowledge looks like in the classroom. This understanding is essential to planning engaging lessons, delivering effective classroom instruction and developing valid assessments that are a balanced combination of factual knowledge, procedural fluency and conceptual knowledge. 10 Concepts Every Math Teacher Should Know demonstrates the following:-It is important for teachers to have a clear understanding of how concepts evolve across grade levels.-Understanding how these concepts evolve will help teachers design experiences for students that deepen their understanding of mathematics.-Understanding how these concepts work will build our students' confidence in their ability to be problem solvers.-It is critical for teachers to use the same conceptual language across grade levels to increase our students' chances of success.