Emacs users, you can use Calc’s embedded mode to adjust numbers quickly while editing the journal. Eg, to divide a number by 2, put the cursor in it, then press C-x * w 2 / q.
Calc rewrites decimal numbers to a standard format, hiding trailing zeros by default, which you may not want. To preserve trailing zeros, you must force a fixed number of decimal digits. In calc mode (eg before pressing q above) do:
d f 2 returnto force two digits (eg shows .00)d f 3 returnto force three digits (eg shows .005 when there's a half cent)d nto choose normal mode (shows all digits except trailing zeros)
And to ensure that such config changes are saved in (and reloaded from) ~/.emacs.d/calc.el rather than the current buffer, add this to your emacs config:
(setq calc-mode-save-mode 'save)