• mankoff

    I prefer “macro-math”: https://github.com/nschum/macro-math.el/blob/master/macro-math.el

    With:

    “`
    (require ‘macro-math)
    (global-set-key “C-x~” ‘macro-math-eval-and-round-region)
    (global-set-key “C-x=” ‘macro-math-eval-region)

    “`

    You can then highlight an equation in a buffer, “C-x =”, and the results are printed there.