Explore the fundamentals of addition in this 36-minute educational video from the "Elementary Mathematics (K-6) Explained" series. Begin with adding numbers in the 1-5 range, then progress to the 1-10 range. Learn the names of numbers 11-20, including an alternative numbering system to address the inconsistencies in English number naming. Organize addition concepts into tables and discover their useful properties. Follow along as the instructor systematically explains adding 2 to a number, efficient table layouts, and the challenges of number naming conventions. Gain a solid foundation in this crucial mathematical operation through clear explanations and visual demonstrations.