How to find depent source files of one target automatically in CMake - cmake

Question

I have some files in my project, this is the structure:
main.cpp
addition.cpp
division.cpp
print_result.cpp
I write a CMakeLists like below and it can work well:
cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
project(Calculator_Project VERSION 1.0.0)
add_executable(calculator
main.cpp
addition.cpp
division.cpp
print_result.cpp)
or
cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
project(Calculator_Project VERSION 1.0.0)
add_library(my_math addition.cpp division.cpp)
add_library(my_print print_result.cpp)
add_executable(calculator main.cpp)
target_link_libraries(calculator my_math my_print)
However, if I want to add more modules such as multiplication or subtraction... I have to add these modules to the CMakeLists.txt as below, it looks not well.
add_executable(calculator
main.cpp
addition.cpp
division.cpp
multiplication.cpp
subtraction.cpp
print_result.cpp)
or
add_library(my_math
addition.cpp
division.cpp
multiplication.cpp
subtraction.cpp)
I know three is a way like this can solve the problem:
file(GLOB SOURCES "src/*.cpp")
add_executable(calculator ${SOURCES})
but it will add all the source files to one target, this is not a good idea. I just want to get the source files that the target depends on. In particular, if one target depends on many libraries, it is not an easy task to add all relevant dependencies to each target, so I want to ask if there is a better way to simplify it.