Numerical representation is a process of digitization that turns information into discrete steps. An example of this would be GPS navigation. When you put a destination in the maps app or website, it gives you a list of steps as to how to get to that destination. Another example would be a Home Depot step by step process of how to build a deck.
Modularity is “the degree to which a system’s components may be separated and recombined” (Wikipedia). For example, a Fitbit is a watch that calculates steps, heart rate, calories, time, stairs of a person daily. These are human components separated and recombined.