Christina Tondevold highlights the crucial role of number sense in education, describing it as an intuitive understanding of numbers developed through exploration and visualization. She outlines four key relationships essential for fostering number sense: spatial relationships, one and two more/less, benchmarks of 5 and 10, and part-part-whole understanding. Tondevold emphasizes that nurturing number sense enhances problem-solving skills and aids in mastering math standards, urging educators to prioritize this foundational concept. A free ebook is available for further insights on number sense relationships and assessment tools, there is one for PreK-2 and now the 3rd-5th is available as well: BuildMathMinds.com/numbersense ------------------------------------------------------------------------ For more in-depth trainings on specific elementary math content, join the Build Math Minds PD site: https://buildmathminds.com/bmm/ The Build Math Minds PD site provides elementary educators with PD and resources to better understand the mathematics you need to teach, so that you can help your students become flexible thinkers in math. You can check out the other resources we have made to help build elementary kids’ math minds here: https://buildmathminds.com/shop/