IMC member school Rock Prairie Montessori School in Janesville, Wisconsin has a marketing feature called Montessori Materials Mondays that they share on social media and on their website. RPMS is fortunate to have faculty who are Instructional guides and graduates of the CGMS teacher training programs. The video snippets are short, 30 seconds or so and representing all levels of the school toddler, primary, lower elementary and upper elementary. For the upper elementary we are having the students narrate the video. If you wish to see more, visit RockPrairieMontessori.com and find it under Parent Resources.
Check out the video to understand how square roots are found for large numbers by simplifying to perfect squares and making exchanges on the square root board. https://youtu.be/