Adding things up sometimes really sucks. Calculators are great, but only if you can have the sassy adding machine kind on your desk. Otherwise, Excel formulas really do the trick. Admitting you don’t know how to use a graphing calculator at work: never recommended. It doesn’t matter if no one uses them after AP Calculus: everyone seems to think they still know everything they did when they were 18. Now, long dividing during a meeting: that’s power-lifting for the brain muscle.