I learned the conversion factors in high school more than 60 years ago, and dealing with metric weights and measures has really never been a problem. When pocket calculators came along, the results were both quicker and more accurate. Now we have calculators on our "smart phones." I don't understand the anxiety and resentment.
+1`
Just try to use your smart phone to add and subtract numbers over 6 figures! Rest assured you have to know how to use a calculator and the calculator has to be up to the task. Most phone calculators are just for dummies to check out their bank accounts.
My phone will do fine with up to 9 figures. There again it is easy enough to use a pencil and paper for addition and subtraction.
Of course, the point's a bit moot really. How often do you really need to do those 6+ figure calculations manually at all?
