Can you please give an example of “big tech companies give mid-career job candidates "tests" that heavily involve the speed of basic calculation”. Having worked

Can you please give an example of “big tech companies give mid-career job candidates "tests" that heavily involve the speed of basic calculation”. Having worked 30 years in very big companies (10k+ employees) in 5 different countries, i have never had, or ever heard of, any tests which require speed of basic calculations in any color, shape or form.