Question

Computer add 13 to 27 where does this activity take place

Answer 1

Answer:

At the "very bottom" numbers are just binary, and physical electronic hardware is used to perform the addition operation itself1 (where each bit in the number is represented by an on/off of the physical circuit line) - this is done by some variation of an an Adder circuit.

For "how" the math works see Two's complement: Aritmetic, which is the most commonly used integer encoding. Conceptually such arithmetic is similar to that of other bases, such as base-10/decimal taught in school.

1 Modern/conventional computers: there have been mechanical computers (at least insofar as 'calculating machines'), analog computers, and takes on quantum computers, etc.

Hope it helps