To turn those four children, who were young, illiterate, and nearly blank slates, into useful helpers, Li Yu needed to provide them with some essential training.
First up was teaching them numeral notation and basic arithmetic.
Since numerals are one of the important cornerstones of civilization, almost all modern natural sciences can't do without numerical operations, especially the deeper one delves into their studies—reaching master's and doctoral levels—when one can truly appreciate the importance of mathematics as a research tool.
Aside from these cutting-edge research fields, numerals also play an extremely important role in everyday life.
Without numerals, transactions couldn't be conducted, it would be hard to express how many sheep one ax could exchange for, and even the most fundamental statistical tasks couldn't be undertaken.
The many civilizations on the Bratis Continent, of course, had their numeral systems.
