The Hindu-Arabic number system is the most important single advance in the history of science and mathematics. In this video we start from a naive Kindergarten approach to numbers, and then move to a simplified Roman numeral system, as a stepping stone to the Hindu-Arabic system. Along the way we introduce the usual names and symbols for the numbers 1-9, mention the big role that the number zero (0) plays, and discuss the world's earliest and most popular calculator---the abacus.

1. Counting using the grid plane
2. Arithmetic with rectangles
3. Number systems throughout history
4. The Hindu-Arabic number system
5. Laws of arithmetic using geometry
6. Fun with polyominoes
7. Addition and the names of numbers
8. Addition in practice
9. Multiples, and more names of numbers
10. Word problems using addition
11. Elementary projective (line) geometry
12. Pappus and Pascal
13. Logical reasoning with tic-tac-toe
14. The multiplication table
15. More multiplication: The 10x10 table
16. Some tricks to help with multiplication
17. Area problems using multiplication
18. The time scale of a human life
19. An introduction to measuring

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The series is meant for those who are teaching public or high school, parents who have children in those years, and anyone who would like to strengthen their understanding of the subject.